整式的加减 专项练习100题(含答案)

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《整式的加减》专项练习题(有答案)

《整式的加减》专项练习题(有答案)

《整式的加减》练习100题 1、3(a+5b )-2(b-a )2、3a-(2b-a )+b3、2(2a+9b )+3(-5a-4b )4、(x 3-2y 3-3x 2y )-(3x 3-3y 3-7x 2y )5、3x-[7x-(4x-3)-2x]6、(2xy-y )-(-y+yx )7、5(ab-3ab )-2(ab-7ab )8、(-2ab+3a )-2(2a-b )+2ab9、(7mn-5mn )-(4mn-5mn )、10、(5a 2+2a-1)-4(3-8a+2a 2).11、-3xy+3xy+2xy-2xy ;12、2(a-1)-(2a-3)+3.13、-2(ab-3a )-[2b-(5ab+a )+2ab]14、(x-xy+y )-3(x+xy-2y )/29、3x 2-[7x -(4x -3)-2x 2].30、5a+(4b-3a )-(-3a+b );31、)22()233(2222b ab a b ab a -+++-;32、]22)1(2[222222++--+ab b a ab b a33、(2a-1+2a )-3(a-1+a );34、2(x-xy )-3(2x-3xy )-2[x-(2x-xy+y )].35、 -32ab +43a 2b +ab +(-43a 2b )-136、(8xy -x 2+y 2)+(-y 2+x 2-8xy );37、2x -(3x -2y +3)-(5y -2);38、-(3a +2b )+(4a -3b +1)-(2a -b -3)¥39、4x 3-(-6x 3)+(-9x 3)40、3-2xy +2yx 2+6xy -4x 2y41、 1-3(2ab +a )十[1-2(2a -3ab )].56、(a+4ab-4b )-3(a+b )-7(b-ab ).57、a+2a+(-2a )+(-3a )+3a ;58、5ab+(-4ab )+8ab-(-3ab )+(-ab )+4ab ;59、(7y-3z )-(8y-5z );-60、-3(2x 2-xy )+4(x 2+xy-6).61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)62、-3x 2y+2x 2y+3xy 2-2xy 2;63、3(a 2-2ab )-2(-3ab+b 2);64、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}.65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )].66、-[2m-3(m-n+1)-2]-1.67、31a-( 21a-4b-6c)+3(-2c+2b) 68、-5a-a-(-7a )+(-3a )69、xy-3xy+2yx-yx 70、 41 21a 2b+ 52ab 2; ^71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}72、-3(xy-2x )-[y-(5xy-4x )+2xy]73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 74、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32. 75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121; 76、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131 77、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3.79、化简,求值:5x-[3x-2(2x-3)+7x],其中x=-2.80、若两个多项式的和是2x+xy+3y ,一个加式是x-xy ,求另一个加式.…81、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.82、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.83、 求3x 2+x -5与4-x +7x 2的差.84、计算 5y+3x+5z 2与12y+7x-3z 2的和 85、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M 87、当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值. 88、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41 89、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ;—(2)求41(B-A); 90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案91、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B 93、已知A =x 2+xy +y 2,B =-3xy -x 2,求:2(3A-2B )-4(2A-B)94、已知2a+(b+1)2=0,求5ab2-[2a2b-(4ab2-2a2b)]的值.95、化简求值:5abc-2a2b+[3abc-2(4ab2-a2b)],其中a、b、c满足|a-1|+|b-2|+c2=0.96、已知a,b,z满足:(1)已知|x-2|+(y+3)2=0,(2)z是最大的负整数,化简求值:2(x2y+xyz)-3(x2y-xyz)-4x2y.,97、已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值.98、已知m2+3mn=5,求5m2-[+5m2-(2m2-mn)-7mn-5]的值99、设A=2x2-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若|x-2a|+(y-3)2=0,且B-2A=a,求a的值.100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A 与B的大小.¥¥~;…答案:1、3(a+5b)-2(b-a)=5a+13b2、3a-(2b-a)+b=4a-b.3、2(2a+9b)+3(-5a-4b)=—11a2+6b24、(x3-2y3-3x2y)-(3x3-3y3-7x2y)= -2x3+y3+4x2y5、3x-[7x-(4x-3)-2x] = 5x-3x-36、(2xy-y)-(-y+yx)= xy7、5(a2b-3ab2)-2(a2b-7ab)= -a2b+11ab8、(-2ab+3a)-2(2a-b)+2ab= -2a+b 9、(7m2n-5mn)-(4m2n-5mn)= 3m2n10、(5a2+2a-1)-4(3-8a+2a2)= -3a2+34a-13 11、-3x2y+3xy2+2x2y-2xy2= -x2y+xy2。

整式的加减 专项练习100题(含答案)

整式的加减 专项练习100题(含答案)

整式的加减专项练习1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab 9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x2-xy+y)-3(x2+xy-2y)15、3x2-[7x-(4x-3)-2x2]16、a2b-[2(a2b-2a2c)-(2bc+a2c)];17、-2y3+(3xy2-x2y)-2(xy2-y3).18、2(2x-3y)-(3x+2y+1)19、-(3a2-4ab)+[a2-2(2a+2ab)].20、5m-7n-8p+5n-9m-p ;21、(5x 2y-7xy 2)-(xy 2-3x 2y ); 22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a].23、3a 2-9a+5-(-7a 2+10a-5); 24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2).25、(5a-3a 2+1)-(4a 3-3a 2); 26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]27、(8xy -x 2+y 2)+(-y 2+x 2-8xy ); 28、(2x 2-21+3x )-4(x -x 2+21);29、3x 2-[7x -(4x -3)-2x 2]. 30、5a+(4b-3a )-(-3a+b );31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2); 32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].33、(2a 2-1+2a )-3(a-1+a 2); 34、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)].35、 -32ab +43a 2b +ab +(-43a 2b )-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy );37、2x -(3x -2y +3)-(5y -2); 38、-(3a +2b )+(4a -3b +1)-(2a -b -3)39、4x 3-(-6x 3)+(-9x 3) 40、3-2xy +2yx 2+6xy -4x 2y41、 1-3(2ab +a )十[1-2(2a -3ab )].42、 3x -[5x +(3x -2)];43、(3a 2b -ab 2)-(ab 2+3a 2b ) 44、()[]{}y x x y x --+--3233245、(-x 2+5+4x 3)+(-x 3+5x -4) 46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2).47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ). 48、4a 2+2(3ab-2a 2)-(7ab-1).49、 21xy+(-41xy )-2xy 2-(-3y 2x ) 50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m-7n-8p+5n-9m+8p 52、(5x 2y-7xy 2)-(xy 2-3x 2y )53、 3x2y-[2x2y-3(2xy-x2y)-xy] 54、5556、(a2+4ab-4b2)-3(a2+b2)-7(b2-ab).57、a2+2a3+(-2a3)+(-3a3)+3a2;58、5ab+(-4a2b2)+8ab2-(-3ab)+(-a2b)+4a2b2; 59、(7y-3z)-(8y-5z);60、-3(2x2-xy)+4(x2+xy-6).61、(x3+3x2y-5xy2+9y3)+(-2y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)62、-3x2y+2x2y+3xy2-2xy2; 63、3(a2-2ab)-2(-3ab+b2);64、5abc-{2a2b-[3abc-(4a2b-ab2]}.65、5m2-[m2+(5m2-2m)-2(m2-3m)].66、-[2m-3(m-n+1)-2]-1.67、31a-( 21a-4b-6c)+3(-2c+2b) 68、 -5a n -a n -(-7a n )+(-3a n ) 69、x 2y-3xy 2+2yx 2-y 2x70、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2;71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}72、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy];73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-13177、化简、求值2(a2b+2b3-ab3)+3a3-(2ba2-3ab2+3a3)-4b3,其中a=-3,b=278、化简,求值:(2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3),其中x=1,y=2,z=-3.79、化简,求值:5x2-[3x-2(2x-3)+7x2],其中x=-2.80、若两个多项式的和是2x2+xy+3y2,一个加式是x2-xy,求另一个加式.81、若2a2-4ab+b2与一个多项式的差是-3a2+2ab-5b2,试求这个多项式.82、求5x2y-2x2y与-2xy2+4x2y的和.83、求3x2+x-5与4-x+7x2的差.84、计算 5y+3x+5z2与12y+7x-3z2的和85、计算8xy2+3x2y-2与-2x2y+5xy2-3的差86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M87、当3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.88、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ; (2)求41(B-A);90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B93、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .94、已知2 a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.95、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0.96、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值:2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .97、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值.98、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值99、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值.100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A 与B 的大小.整式的加减专项练习答案:1、3(a+5b )-2(b-a )=5a+13b2、3a-(2b-a )+b=4a-b .3、2(2a 2+9b )+3(-5a 2-4b )=—11a 2+6b 2 4、(x 3-2y 3-3x 2y )-(3x 3-3y 3-7x 2y )= -2x 3+y 3+4x 2y5、3x 2-[7x-(4x-3)-2x 2] = 5x 2 -3x-36、(2xy-y )-(-y+yx )= xy7、5(a 22b-3ab 2)-2(a 2b-7ab ) = -a 2b+11ab 8、(-2ab+3a )-2(2a-b )+2ab= -2a+b9、(7m 2n-5mn )-(4m 2n-5mn )= 3m 2n10、(5a 2+2a-1)-4(3-8a+2a 2)= -3a 2+34a-1311、-3x 2y+3xy 2+2x 2y-2xy 2= -x 2y+xy 212、2(a-1)-(2a-3)+3.=413、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]= 7a 2+ab-2b 214、(x 2-xy+y )-3(x 2+xy-2y )= -2x 2-4xy+7y15、3x 2-[7x-(4x-3)-2x 2]=5x 2-3x-3 16、a 2b-[2(a 2b-2a 2c )-(2bc+a 2c )]= -a 2b+2bc+6a 2c17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3)= xy 2-x 2y18、2(2x-3y )-(3x+2y+1)=2x-8y-1 19、-(3a 2-4ab )+[a 2-2(2a+2ab )]=-2a 2-4a20、5m-7n-8p+5n-9m-p = -4m-2n-9p21、(5x 2y-7xy 2)-(xy 2-3x 2y )=4xy 2-4x 2y22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a]=-18a 2 +7a+223、3a 2-9a+5-(-7a 2+10a-5)=10a 2-19a+1024、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2)= -4a 2b-64ab 225、(5a-3a 2+1)-(4a 3-3a 2)=5a-4a 2+126、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]=7a 2+ab-2b 2 27、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=028、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x-25 29、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a+(4b-3a )-(-3a+b )= 5a+3b31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2)= 4a 2-ab32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].= -133、(2a 2-1+2a )-3(a-1+a 2)= -a 2-a+234、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)]=-2x 2+5xy-2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 = 31ab-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x-3y-138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a-4b+439、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y+441、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42、 3x -[5x +(3x -2)]=-5x+243、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x+y45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x+1 46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2)=a 2+9a-147、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).=3a 2b-ab 248、4a 2+2(3ab-2a 2)-(7ab-1)=1-ab49、 21xy+(-41xy )-2xy 2-(-3y 2x )=41xy+xy 2 50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a51、5m-7n-8p+5n-9m+8p=-4m-2n59、(7y-3z )-(8y-5z )=-y+2z60、-3(2x 2-xy )+4(x 2+xy-6)=-2x 2+7xy-24 61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)=0 62、-3x 2y+2x 2y+3xy 2-2xy 2 = -x 2y+xy 263、3(a 2-2ab )-2(-3ab+b 2)=3a 2-2b 264、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}=8abc-6a 2b+ab 265、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m66、-[2m-3(m-n+1)-2]-1=m-3n+467、31a-( 21a-4b-6c)+3(-2c+2b)= -61a+10b 68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、x 2y-3xy 2+2yx 2-y 2x=3x 2y-4xy 271、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2 = -41a 2b 71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}= 10a+9b-2c-672、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]= 2x 2-y 2 73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =698 74、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32. 原式=-3x+y 2=694 75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121; 原式=x 3+x 2-x+6=68376、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131 原式=5m-3n-1=577、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =2原式=-2ab 3+3ab 2=1278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3.原式=-2xyz=679、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.原式=-2x 2+x-6=-1680、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.(2x 2+xy+3y 2 ) ——( x 2-xy )= x 2+2xy+3y 281、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.( 2a 2-4ab+b 2 )—(-3a 2+2ab-5b 2)=5a 2 -6ab+6b 282、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.(5x 2y -2x 2y )+(-2xy 2+4x 2y )=3xy 2+2x 2y83、 求3x 2+x -5与4-x +7x 2的差.(3x 2+x -5)—(4-x +7x 2)=—4x 2+2x -984、计算 5y+3x+5z 2与12y+7x-3z 2的和(5y+3x+5z 2)+(12y+7x-3z 2)=17y+10x+2z 285、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差(8xy 2+3x 2y-2)—(-2x 2y+5xy 2-3)=5x 2y+3xy 2+186、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M23y 87、当3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值. 原式=-8xy+y= —1588、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41 原式=83abc-a 2b-2ab 2=3689、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2 (1)求A+B ;(2)求41(B-A); A+B=2a 2+2b 2 41(B-A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得 9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?A=10x 2+x+5 A+B=11x 2+4x+391、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .M-2N=5x 2-4x+392、已知222244,5A x xy y B x xy y =-+=+-,求3A -B3A -B=11x 2-13xy+8y 293、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .2A -3B= 5x 2+11xy +2y 294、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值. 原式=9ab 2-4a 2b=3495、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0. 原式=8abc-8a 2b=-3296、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值: 2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .原式=-5x 2y+5xyz=9097、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值. 原式=10a+10b-2ab=5098、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值原式=2m 2+6mn+5=1599、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值. B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A与B 的大小. A=2a 2-4a +1 B =2a 2-4a +3 所以A<B。

整式的加减》专项练习100题(已排版好,可直接打印,有答案)

整式的加减》专项练习100题(已排版好,可直接打印,有答案)

整式的加减》专项练习100题(已排版好,可直接打印,有答案)1.3(a+5b) - 2(b-a)2.3x^2 - [7x - (4x - 3) - 2x^2]3.2(2a^2 + 9b) + 3(-5a^2 - 4b)4.(x^3 - 2y^3 - 3x^2y) - (3x^3 - 3y^3 - 7x^2y)5.(2xy - y) - (-y + yx)6.5(a^2b - 3ab^2) - 2(a^2b - 7ab)7.(-2ab + 3a) - 2(2a - b) + 2ab8.(7m^2n - 5mn) - (4m^2n - 5mn)9.(5a^2 + 2a - 1) - 4(3 - 8a + 2a^2)10.-3x^2y + 3xy^2 + 2x^2y - 2xy^211.2(a - 1) - (2a - 3) + 312.-2(ab - 3a^2) - [2b^2 - (5ab + a^2) + 2ab]13.(x^2 - xy + y) - 3(x^2 + xy - 2y)14.3x^2 - [7x - (4x - 3) - 2x^2]15.a^2b - [2(a^2b - 2a^2c) - (2bc + a^2c)]16.-2y^3 + (3xy^2 - x^2y) - 2(xy^2 - y^3)17.2(2x - 3y) - (3x + 2y + 1)18.-(3a^2 - 4ab) + [a^2 - 2(2a + 2ab)]19.5m - 2n - 9p20.3(-3a^2 - 2a) - [a^2 - 2(5a - 4a^2 + 1) - 3a]21.3a^2 - 9a + 1022.-3a^2b - (2ab^2 - a^2b) - (2a^2b + 4ab^2)23.(5a - 3a^2 + 1) - (4a^3 - 3a^2)24.2a^2b + 2ab^2 - [2(a^2b - 1) + 2ab^2]25.(2a^2 - 1 + 2a) - 3(a - 1 + a^2)26.2xy - 5a^2 - 6ab + 2b^227.(3x - 2y + 3)28.5a + 2b29.(3a^2 - 3ab + 2b^2) + (a^2 + 2ab - 2b^2)30.2a^2 - 3(a - 1 + a^2)31.2a^2b - 2ab + 265、3x2y-2xy2+5x2y-3xy2;66、(3a2b-ab2)+(-2a2b+3ab2);67、(5x2y-7xy2)-(-2xy2+3x2y);68、4a2b-2ab2+(-3a2b+ab2);69、(x2y+2xy2-3y3)+(-2x2y+3xy2+y3);70、(4a2b-2ab2+3ab)-(-3a2b+ab2+2ab);71、(3x2y-5xy2+4y3)+(-2x2y+3xy2-y3);72、(5a2b2-2ab2+3ab)-(2a2b2+ab2-4ab).34、化简:2(x^2-xy)-3(2x^2-3xy)38、化简:-(3a+2b)+(4a-3b+1)-(2a-b-2[x^2-(2x^2-xy+y^2)]-3)35、化简:-ab+a^2b+ab-(-a^2b)39、化简:4x-(-6x)+(-9x)36、化简:(8xy-x^2+y^2)+(-y^2+x^2-8xy)40、化简:3-2xy+2yx^2+6xy-4x^2y41、化简:1-3(2ab+a)[1-2(2a-3ab)]45、化简:(-x^2+5+4x^3)+(-x^3+5x-4)42、化简:3x-[5x+(3x-2)]43、化简:(3a^2b-ab^2)-(ab^2+3a^2b)44、化简:2x-(-3y+[3x-2(3x-y)])46、化简:(5a^2-2a+3)-(1-2a+a^2)+3(-1+3a-a^2)47、化简:5(3a^2b-ab^2)-4(-ab^2+3a^2b)48、化简:4a^2+2(3ab-2a^2)-(7ab-1)49、化简:xy-(-xy)-2xy^2-(-3y^2x)53、化简:3x^2y-[2x^2y-3(2xy-x^2y)-xy]50、化简:5a-[a-(5a-2a)-2(a-3a)]51、化简:5m-7n-8p+5n-9m+8p52、化简:(5x^2y-7xy^2)-(xy^2-3x^2y)54、化简:3x^2-[5x-4(1/2x-1)]+5x^2/255、化简:2a^3b-a^2b+a^2b-ab^2/256、化简:(a^2+4ab-4b^2)-3(a^2+b^2)-7(b^2-ab)57、化简:a^2+2a^3-2a^3-3a^361、化简:(x^3+3x^2y-5xy^2+9y^3)+(-2y^3+3a^2+2xy^2+x^2y-2x^3)-(4x^2y-x^3-3xy^2+7y^3)58、化简:5ab-(-4a^2b^2)+8ab^2-(-3ab)-(-a^2b)+4a^2b^259、化简:7y-3z-8y+5z60、化简:-3(2x^2-xy)+4(x^2+xy-6)62、化简:-3x^2y+2x^2y+3xy^2-2xy^263、化简:3(a^2-2ab)-2(-3ab+b^2)64、化简:5abc-{2a^2b-[3abc-(4a^2b-ab^2)]}65、化简:3x^2y-2xy^2+5x^2y-3xy^266、化简:(3a^2b-ab^2)+(-2a^2b+3ab^2)67、化简:(5x^2y-7xy^2)-(-2xy^2+3x^2y)68、化简:4a^2b-2ab^2+(-3a^2b+ab^2)69、化简:(x^2y+2xy^2-3y^3)+(-2x^2y+3xy^2+y^3)70、化简:(4a^2b-2ab^2+3ab)-(-3a^2b+ab^2+2ab)71、化简:(3x^2y-5xy^2+4y^3)+(-2x^2y+3xy^2-y^3)72、化简:(5a^2b^2-2ab^2+3ab)-(2a^2b^2+ab^2-4ab)2时,求多项式2x3-3x2+5x-1的值。

整式的加减练习100题(有答案)

整式的加减练习100题(有答案)

整式的加减专项练习100题1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x2-xy+y)-3(x2+xy-2y)15、3x2-[7x-(4x-3)-2x2]16、a2b-[2(a2b-2a2c)-(2bc+a2c)];17、-2y3+(3xy2-x2y)-2(xy2-y3).18、2(2x-3y)-(3x+2y+1)19、-(3a2-4ab)+[a2-2(2a+2ab)].20、5m-7n-8p+5n-9m-p;21、(5x2y-7xy2)-(xy2-3x2y);22、3(-3a2-2a)-[a2-2(5a-4a2+1)-3a].23、3a2-9a+5-(-7a2+10a-5);24、-3a2b-(2ab2-a2b)-(2a2b+4ab2).25、(5a-3a2+1)-(4a3-3a2);26、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]27、(8xy-x2+y2)+(-y2+x2-8xy);28、(2x2-21+3x)-4(x-x2+21);29、3x2-[7x-(4x-3)-2x2].30、5a+(4b-3a)-(-3a+b);31、(3a2-3ab+2b2)+(a2+2ab-2b2);32、2a2b+2ab2-[2(a2b-1)+2ab2+2].33、(2a2-1+2a)-3(a-1+a2);34、2(x2-xy)-3(2x2-3xy)-2[x2-(2x2-xy+y2)].35、-32ab+43a2b+ab+(-43a2b)-136、(8xy-x2+y2)+(-y2+x2-8xy);37、2x-(3x-2y+3)-(5y-2);38、-(3a+2b)+(4a-3b+1)-(2a-b-3)39、4x3-(-6x3)+(-9x3)40、3-2xy+2yx2+6xy-4x2y41、1-3(2ab+a)十[1-2(2a-3ab)].42、3x-[5x+(3x-2)];43、(3a2b-ab2)-(ab2+3a2b)44、()[]{}yxxyx--+--3233245、(-x2+5+4x3)+(-x3+5x-4)46、(5a2-2a+3)-(1-2a+a2)+3(-1+3a-a2).47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).48、4a 2+2(3ab-2a 2)-(7ab-1).49、21xy+(-41xy )-2xy 2-(-3y 2x )50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m-7n-8p+5n-9m+8p52、(5x 2y-7xy 2)-(xy 2-3x 2y )53、 3x 2y-[2x 2y-3(2xy-x 2y )-xy]54、 3x 2-[5x-4( 21x 2-1)]+5x 2 55、2a 3b-21a 3b-a 2b+ 21a 2b-ab 2;56、(a 2+4ab-4b 2)-3(a 2+b 2)-7(b 2-ab ).57、a 2+2a 3+(-2a 3)+(-3a 3)+3a258、5ab+(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2;59、(7y-3z )-(8y-5z );60、-3(2x 2-xy )+4(x 2+xy-6).61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)62、-3x 2y+2x 2y+3xy 2-2xy 2;63、3(a 2-2ab )-2(-3ab+b 2);64、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}.65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )].66、-[2m-3(m-n+1)-2]-1. 67、31a-( 21a-4b-6c)+3(-2c+2b)68、 -5a n-a n-(-7a n)+(-3a n)69、x 2y-3xy 2+2yx 2-y 2x70、41a 2b-0.4ab 2-21a 2b+52ab 2;71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}72、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy];73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-13177、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-79、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.80、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.81、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.82、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.83、 求3x 2+x -5与4-x +7x 2的差.84、计算 5y+3x+5z 2与12y+7x-3z 2的和85、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M87、当x=-21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.88、化简再求值5abc-{2a2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2 (1)求A+B ; (2)求41(B-A);90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B93、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .94、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.95、化简求值:5abc-2a2b+[3abc-2(4ab2-a2b)],其中a、b、c满足|a-1|+|b-2|+c2=0.96、已知a,b,z满足:(1)已知|x-2|+(y+3)2=0,(2)z是最大的负整数,化简求值:2(x2y+xyz)-3(x2y-xyz)-4x2y.97、已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值.98、已知m2+3mn=5,求5m2-[+5m2-(2m2-mn)-7mn-5]的值99、设A=2x2-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若|x-2a|+(y-3)2=0,且B-2A=a,求a的值.100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A与B的大小.答案:1、3(a+5b )-2(b-a )=5a+13b2、3a-(2b-a )+b=4a-b .3、2(2a 2+9b )+3(-5a 2-4b )=—11a 2+6b 24、(x 3-2y 3-3x 2y )-(3x 3-3y 3-7x 2y )= -2x 3+y 3+4x 2y5、3x 2-[7x-(4x-3)-2x 2] = 5x 2-3x-3 6、(2xy-y )-(-y+yx )= xy7、5(a 22b-3ab 2)-2(a 2b-7ab ) = -a 2b+11ab8、(-2ab+3a )-2(2a-b )+2ab= -2a+b 9、(7m 2n-5mn )-(4m 2n-5mn )= 3m 2n10、(5a 2+2a-1)-4(3-8a+2a 2)= -3a 2+34a-13 11、-3x 2y+3xy 2+2x 2y-2xy 2= -x 2y+xy 2 12、2(a-1)-(2a-3)+3.=413、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]= 7a 2+ab-2b 214、(x 2-xy+y )-3(x 2+xy-2y )= -2x 2-4xy+7y15、3x 2-[7x-(4x-3)-2x 2]=5x 2-3x-316、a 2b-[2(a 2b-2a 2c )-(2bc+a 2c )]= -a 2b+2bc+6a 2c 17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3)= xy 2-x 2y 18、2(2x-3y )-(3x+2y+1)=2x-8y-1 19、-(3a 2-4ab )+[a 2-2(2a+2ab )]=-2a 2-4a20、5m-7n-8p+5n-9m-p = -4m-2n-9p 21、(5x 2y-7xy 2)-(xy 2-3x 2y )=4xy 2-4x 2y 22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a]=-18a 2 +7a+2 23、3a 2-9a+5-(-7a 2+10a-5)=10a 2-19a+10 24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2)= -4a 2b-64ab 2 25、(5a-3a 2+1)-(4a 3-3a 2)=5a-4a 2+1 26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]=7a 2+ab-2b 227、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=028、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x-25 29、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a+(4b-3a )-(-3a+b )= 5a+3b31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2)= 4a 2-ab32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].= -133、(2a 2-1+2a )-3(a-1+a 2)= -a 2-a+2 34、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)]=-2x 2+5xy-2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 = 31ab-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x-3y-138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a-4b+4 39、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y+4 41、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42、 3x -[5x +(3x -2)]=-5x+243、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x+y 45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x+1 46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2)=a 2+9a-1 47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).=3a 2b-ab 248、4a 2+2(3ab-2a 2)-(7ab-1)=1-ab 49、21xy+(-41xy )-2xy 2-(-3y 2x )=41xy+xy 250、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a 51、5m-7n-8p+5n-9m+8p=-4m-2n59、(7y-3z )-(8y-5z )=-y+2z 60、-3(2x2-xy )+4(x 2+xy-6)=-2x2+7xy-2461、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)=062、-3x 2y+2x 2y+3xy 2-2xy 2 = -x 2y+xy 263、3(a 2-2ab )-2(-3ab+b 2)=3a 2-2b 264、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}=8abc-6a 2b+ab 2 65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m 66、-[2m-3(m-n+1)-2]-1=m-3n+467、31a-( 21a-4b-6c)+3(-2c+2b)= -61a+10b 68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、71、 71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}= 10a+9b-2c-672、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]= 2x 2-y 273、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =69874、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.原式=-3x+y 2=69475、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121; 原式=x 3+x 2-x+6=68376、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131 原式=5m-3n-1=577、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =2原式=-2ab 3+3ab 2=12 78、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3. 原式=-2xyz=679、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.原式=-2x 2+x-6=-1680、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.(2x 2+xy+3y 2 ) ——( x 2-xy )= x 2+2xy+3y 2 81、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.( 2a 2-4ab+b 2 )—(-3a 2+2ab-5b 2)=5a 2 -6ab+6b 282、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.(5x 2y -2x 2y )+(-2xy 2+4x 2y )=3xy 2+2x 2y 83、 求3x 2+x -5与4-x +7x 2的差.(3x 2+x -5)—(4-x +7x 2)=—4x 2+2x -984、计算 5y+3x+5z 2与12y+7x-3z 2的和(5y+3x+5z 2)+(12y+7x-3z 2)=17y+10x+2z 285、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差(8xy 2+3x 2y-2)—(-2x 2y+5xy 2-3)=5x 2y+3xy 2+1 86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M M=-21x 2+4xy —23y87、当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.原式=-8xy+y= —15 88、化简再求值5abc-{2a2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41原式=83abc-a 2b-2ab 2=3689、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2 (1)求A+B ; (2)求41(B-A); A+B=2a 2+2b 241(B-A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?A=10x 2+x+5 A+B=11x 2+4x+391、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N . M-2N=5x 2-4x+392、已知222244,5A x xy y B x xy y =-+=+-,求3A -B3A -B=11x 2-13xy+8y 293、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B . 2A -3B= 5x 2+11xy +2y 294、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.原式=9ab 2-4a 2b=3495、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0.原式=8abc-8a2b=-3296、已知a,b,z满足:(1)已知|x-2|+(y+3)2=0,(2)z是最大的负整数,化简求值:2(x2y+xyz)-3(x2y-xyz)-4x2y.原式=-5x2y+5xyz=9097、已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值.原式=10a+10b-2ab=5098、已知m2+3mn=5,求5m2-[+5m2-(2m2-mn)-7mn-5]的值原式=2m2+6mn+5=1599、设A=2x2-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若|x-2a|+(y-3)2=0,且B-2A=a,求a的值.B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A与B的大小.A=2a2-4a+1 B=2a2-4a+3 所以A<B。

整式的加减练习100题(有答案)

整式的加减练习100题(有答案)

整式的加减练习100题(有答案)1.3a + 13b2.4a - 2b3.-4a^2 - 15b4.-2x^3 + y^3 + 4x^2y5.x^2 + 2x - 36.3xy7.3a^2b + 21ab8.-2a + 4b9.3m^2n10.-8a^2 - 7a + 1311.-xy^212.613.-2ab - a^2 + 2b^214.-2x^2 - 4xy + 5y15.x^2 + 7x - 316.-2a^2c - bc17.-3y^3 - 2xy^2 + 2y^218.x - 7y - 119.-3a^2 - 2a20.-4m - 2p21.3ab22.-16a - 223.8a^2 - 19a + 1024.-a^2b - 6ab^225.3a^2 - 3a - 126.-3ab + 3a^2 - 2b^2 - 5ab - a^227.028.-2x^2 + 7x - 1/229.2x^2 - 6x + 330.9a + 4b31.4a^232.2a^2b - 233.-a^2 - 2a + 334.-3x^2 + 5xy - y^235.036.037、2x-(3x-2y+3)-(5y-2);改写为。

2x-3x+2y-3-5y+2 = -3x-3y-138、-(3a+2b)+(4a-3b+1)-(2a-b-3)改写为。

-3a+5b-239、4x3-(-6x3)+(-9x3)改写为。

19x340、3-2xy+2yx2+6xy-4x2y改写为。

2yx2+4xy-4x2y+345、(-x2+5+4x3)+(-x3+5x-4)改写为。

4x3-x3-x2+5x+146、(5a2-2a+3)-(1-2a+a2)+3(-1+3a-a2).改写为。

8a-2a2+12a2-6a-847、5(3a2b-ab2)-4(-ab2+3a2b).改写为。

23a2b48、4a2+2(3ab-2a2)-(7ab-1).改写为。

整式的加减 专项练习100题(含答案)

整式的加减 专项练习100题(含答案)

整式的加减专项练习1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab 9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x2-xy+y)-3(x2+xy-2y)15、3x2-[7x-(4x-3)-2x2]16、a2b-[2(a2b-2a2c)-(2bc+a2c)];17、-2y3+(3xy2-x2y)-2(xy2-y3).18、2(2x-3y)-(3x+2y+1)19、-(3a2-4ab)+[a2-2(2a+2ab)].20、5m-7n-8p+5n-9m-p ;21、(5x 2y-7xy 2)-(xy 2-3x 2y ); 22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a].23、3a 2-9a+5-(-7a 2+10a-5); 24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2).25、(5a-3a 2+1)-(4a 3-3a 2); 26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]27、(8xy -x 2+y 2)+(-y 2+x 2-8xy ); 28、(2x 2-21+3x )-4(x -x 2+21);29、3x 2-[7x -(4x -3)-2x 2]. 30、5a+(4b-3a )-(-3a+b );31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2); 32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].33、(2a 2-1+2a )-3(a-1+a 2); 34、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)].35、 -32ab +43a 2b +ab +(-43a 2b )-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy );37、2x -(3x -2y +3)-(5y -2); 38、-(3a +2b )+(4a -3b +1)-(2a -b -3)39、4x 3-(-6x 3)+(-9x 3) 40、3-2xy +2yx 2+6xy -4x 2y41、 1-3(2ab +a )十[1-2(2a -3ab )].42、 3x -[5x +(3x -2)];43、(3a 2b -ab 2)-(ab 2+3a 2b ) 44、()[]{}y x x y x --+--3233245、(-x 2+5+4x 3)+(-x 3+5x -4) 46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2).47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ). 48、4a 2+2(3ab-2a 2)-(7ab-1).49、 21xy+(-41xy )-2xy 2-(-3y 2x ) 50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m-7n-8p+5n-9m+8p 52、(5x 2y-7xy 2)-(xy 2-3x 2y )53、 3x2y-[2x2y-3(2xy-x2y)-xy] 54、5556、(a2+4ab-4b2)-3(a2+b2)-7(b2-ab).57、a2+2a3+(-2a3)+(-3a3)+3a2;58、5ab+(-4a2b2)+8ab2-(-3ab)+(-a2b)+4a2b2; 59、(7y-3z)-(8y-5z);60、-3(2x2-xy)+4(x2+xy-6).61、(x3+3x2y-5xy2+9y3)+(-2y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)62、-3x2y+2x2y+3xy2-2xy2; 63、3(a2-2ab)-2(-3ab+b2);64、5abc-{2a2b-[3abc-(4a2b-ab2]}.65、5m2-[m2+(5m2-2m)-2(m2-3m)].66、-[2m-3(m-n+1)-2]-1.67、31a-( 21a-4b-6c)+3(-2c+2b) 68、 -5a n -a n -(-7a n )+(-3a n ) 69、x 2y-3xy 2+2yx 2-y 2x70、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2;71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}72、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy];73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-13177、化简、求值2(a2b+2b3-ab3)+3a3-(2ba2-3ab2+3a3)-4b3,其中a=-3,b=278、化简,求值:(2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3),其中x=1,y=2,z=-3.79、化简,求值:5x2-[3x-2(2x-3)+7x2],其中x=-2.80、若两个多项式的和是2x2+xy+3y2,一个加式是x2-xy,求另一个加式.81、若2a2-4ab+b2与一个多项式的差是-3a2+2ab-5b2,试求这个多项式.82、求5x2y-2x2y与-2xy2+4x2y的和.83、求3x2+x-5与4-x+7x2的差.84、计算 5y+3x+5z2与12y+7x-3z2的和85、计算8xy2+3x2y-2与-2x2y+5xy2-3的差86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M87、当3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.88、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ; (2)求41(B-A);90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B93、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .94、已知2 a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.95、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0.96、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值:2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .97、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值.98、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值99、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值.100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A 与B 的大小.整式的加减专项练习答案:1、3(a+5b )-2(b-a )=5a+13b2、3a-(2b-a )+b=4a-b .3、2(2a 2+9b )+3(-5a 2-4b )=—11a 2+6b 2 4、(x 3-2y 3-3x 2y )-(3x 3-3y 3-7x 2y )= -2x 3+y 3+4x 2y5、3x 2-[7x-(4x-3)-2x 2] = 5x 2 -3x-36、(2xy-y )-(-y+yx )= xy7、5(a 22b-3ab 2)-2(a 2b-7ab ) = -a 2b+11ab 8、(-2ab+3a )-2(2a-b )+2ab= -2a+b9、(7m 2n-5mn )-(4m 2n-5mn )= 3m 2n10、(5a 2+2a-1)-4(3-8a+2a 2)= -3a 2+34a-1311、-3x 2y+3xy 2+2x 2y-2xy 2= -x 2y+xy 212、2(a-1)-(2a-3)+3.=413、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]= 7a 2+ab-2b 214、(x 2-xy+y )-3(x 2+xy-2y )= -2x 2-4xy+7y15、3x 2-[7x-(4x-3)-2x 2]=5x 2-3x-3 16、a 2b-[2(a 2b-2a 2c )-(2bc+a 2c )]= -a 2b+2bc+6a 2c17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3)= xy 2-x 2y18、2(2x-3y )-(3x+2y+1)=2x-8y-1 19、-(3a 2-4ab )+[a 2-2(2a+2ab )]=-2a 2-4a20、5m-7n-8p+5n-9m-p = -4m-2n-9p21、(5x 2y-7xy 2)-(xy 2-3x 2y )=4xy 2-4x 2y22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a]=-18a 2 +7a+223、3a 2-9a+5-(-7a 2+10a-5)=10a 2-19a+1024、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2)= -4a 2b-64ab 225、(5a-3a 2+1)-(4a 3-3a 2)=5a-4a 2+126、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]=7a 2+ab-2b 2 27、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=028、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x-25 29、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a+(4b-3a )-(-3a+b )= 5a+3b31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2)= 4a 2-ab32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].= -133、(2a 2-1+2a )-3(a-1+a 2)= -a 2-a+234、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)]=-2x 2+5xy-2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 = 31ab-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x-3y-138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a-4b+439、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y+441、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42、 3x -[5x +(3x -2)]=-5x+243、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x+y45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x+1 46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2)=a 2+9a-147、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).=3a 2b-ab 248、4a 2+2(3ab-2a 2)-(7ab-1)=1-ab49、 21xy+(-41xy )-2xy 2-(-3y 2x )=41xy+xy 2 50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a51、5m-7n-8p+5n-9m+8p=-4m-2n59、(7y-3z )-(8y-5z )=-y+2z60、-3(2x 2-xy )+4(x 2+xy-6)=-2x 2+7xy-24 61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)=0 62、-3x 2y+2x 2y+3xy 2-2xy 2 = -x 2y+xy 263、3(a 2-2ab )-2(-3ab+b 2)=3a 2-2b 264、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}=8abc-6a 2b+ab 265、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m66、-[2m-3(m-n+1)-2]-1=m-3n+467、31a-( 21a-4b-6c)+3(-2c+2b)= -61a+10b 68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、x 2y-3xy 2+2yx 2-y 2x=3x 2y-4xy 271、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2 = -41a 2b 71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}= 10a+9b-2c-672、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]= 2x 2-y 2 73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =698 74、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32. 原式=-3x+y 2=694 75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121; 原式=x 3+x 2-x+6=68376、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131 原式=5m-3n-1=577、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =2原式=-2ab 3+3ab 2=1278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3.原式=-2xyz=679、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.原式=-2x 2+x-6=-1680、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.(2x 2+xy+3y 2 ) ——( x 2-xy )= x 2+2xy+3y 281、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.( 2a 2-4ab+b 2 )—(-3a 2+2ab-5b 2)=5a 2 -6ab+6b 282、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.(5x 2y -2x 2y )+(-2xy 2+4x 2y )=3xy 2+2x 2y83、 求3x 2+x -5与4-x +7x 2的差.(3x 2+x -5)—(4-x +7x 2)=—4x 2+2x -984、计算 5y+3x+5z 2与12y+7x-3z 2的和(5y+3x+5z 2)+(12y+7x-3z 2)=17y+10x+2z 285、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差(8xy 2+3x 2y-2)—(-2x 2y+5xy 2-3)=5x 2y+3xy 2+186、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M23y 87、当3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值. 原式=-8xy+y= —1588、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41 原式=83abc-a 2b-2ab 2=3689、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2 (1)求A+B ;(2)求41(B-A); A+B=2a 2+2b 2 41(B-A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得 9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?A=10x 2+x+5 A+B=11x 2+4x+391、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .M-2N=5x 2-4x+392、已知222244,5A x xy y B x xy y =-+=+-,求3A -B3A -B=11x 2-13xy+8y 293、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .2A -3B= 5x 2+11xy +2y 294、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值. 原式=9ab 2-4a 2b=3495、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0. 原式=8abc-8a 2b=-3296、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值: 2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .原式=-5x 2y+5xyz=9097、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值. 原式=10a+10b-2ab=5098、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值原式=2m 2+6mn+5=1599、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值. B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A与B 的大小. A=2a 2-4a +1 B =2a 2-4a +3 所以A<B。

整式的加减 专项练习100题(含答案)

整式的加减 专项练习100题(含答案)

整式的加减专项练习1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab 9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x2-xy+y)-3(x2+xy-2y)15、3x2-[7x-(4x-3)-2x2]16、a2b-[2(a2b-2a2c)-(2bc+a2c)];17、-2y3+(3xy2-x2y)-2(xy2-y3).18、2(2x-3y)-(3x+2y+1)19、-(3a2-4ab)+[a2-2(2a+2ab)].20、5m-7n-8p+5n-9m-p ;21、(5x 2y-7xy 2)-(xy 2-3x 2y ); 22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a].23、3a 2-9a+5-(-7a 2+10a-5); 24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2).25、(5a-3a 2+1)-(4a 3-3a 2); 26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]27、(8xy -x 2+y 2)+(-y 2+x 2-8xy ); 28、(2x 2-21+3x )-4(x -x 2+21);29、3x 2-[7x -(4x -3)-2x 2]. 30、5a+(4b-3a )-(-3a+b );31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2); 32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].33、(2a 2-1+2a )-3(a-1+a 2); 34、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)].35、 -32ab +43a 2b +ab +(-43a 2b )-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy );37、2x -(3x -2y +3)-(5y -2); 38、-(3a +2b )+(4a -3b +1)-(2a -b -3)39、4x 3-(-6x 3)+(-9x 3) 40、3-2xy +2yx 2+6xy -4x 2y41、 1-3(2ab +a )十[1-2(2a -3ab )].42、 3x -[5x +(3x -2)];43、(3a 2b -ab 2)-(ab 2+3a 2b ) 44、()[]{}y x x y x --+--3233245、(-x 2+5+4x 3)+(-x 3+5x -4) 46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2).47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ). 48、4a 2+2(3ab-2a 2)-(7ab-1).49、 21xy+(-41xy )-2xy 2-(-3y 2x ) 50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m-7n-8p+5n-9m+8p 52、(5x 2y-7xy 2)-(xy 2-3x 2y )53、 3x2y-[2x2y-3(2xy-x2y)-xy] 54、5556、(a2+4ab-4b2)-3(a2+b2)-7(b2-ab).57、a2+2a3+(-2a3)+(-3a3)+3a2;58、5ab+(-4a2b2)+8ab2-(-3ab)+(-a2b)+4a2b2; 59、(7y-3z)-(8y-5z);60、-3(2x2-xy)+4(x2+xy-6).61、(x3+3x2y-5xy2+9y3)+(-2y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)62、-3x2y+2x2y+3xy2-2xy2; 63、3(a2-2ab)-2(-3ab+b2);64、5abc-{2a2b-[3abc-(4a2b-ab2]}.65、5m2-[m2+(5m2-2m)-2(m2-3m)].66、-[2m-3(m-n+1)-2]-1.67、31a-( 21a-4b-6c)+3(-2c+2b) 68、 -5a n -a n -(-7a n )+(-3a n ) 69、x 2y-3xy 2+2yx 2-y 2x70、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2;71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}72、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy];73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-13177、化简、求值2(a2b+2b3-ab3)+3a3-(2ba2-3ab2+3a3)-4b3,其中a=-3,b=278、化简,求值:(2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3),其中x=1,y=2,z=-3.79、化简,求值:5x2-[3x-2(2x-3)+7x2],其中x=-2.80、若两个多项式的和是2x2+xy+3y2,一个加式是x2-xy,求另一个加式.81、若2a2-4ab+b2与一个多项式的差是-3a2+2ab-5b2,试求这个多项式.82、求5x2y-2x2y与-2xy2+4x2y的和.83、求3x2+x-5与4-x+7x2的差.84、计算 5y+3x+5z2与12y+7x-3z2的和85、计算8xy2+3x2y-2与-2x2y+5xy2-3的差86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M87、当3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.88、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ; (2)求41(B-A);90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B93、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .94、已知2 a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.95、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0.96、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值:2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .97、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值.98、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值99、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值.100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A 与B 的大小.整式的加减专项练习答案:1、3(a+5b )-2(b-a )=5a+13b2、3a-(2b-a )+b=4a-b .3、2(2a 2+9b )+3(-5a 2-4b )=—11a 2+6b 2 4、(x 3-2y 3-3x 2y )-(3x 3-3y 3-7x 2y )= -2x 3+y 3+4x 2y5、3x 2-[7x-(4x-3)-2x 2] = 5x 2 -3x-36、(2xy-y )-(-y+yx )= xy7、5(a 22b-3ab 2)-2(a 2b-7ab ) = -a 2b+11ab 8、(-2ab+3a )-2(2a-b )+2ab= -2a+b9、(7m 2n-5mn )-(4m 2n-5mn )= 3m 2n10、(5a 2+2a-1)-4(3-8a+2a 2)= -3a 2+34a-1311、-3x 2y+3xy 2+2x 2y-2xy 2= -x 2y+xy 212、2(a-1)-(2a-3)+3.=413、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]= 7a 2+ab-2b 214、(x 2-xy+y )-3(x 2+xy-2y )= -2x 2-4xy+7y15、3x 2-[7x-(4x-3)-2x 2]=5x 2-3x-3 16、a 2b-[2(a 2b-2a 2c )-(2bc+a 2c )]= -a 2b+2bc+6a 2c17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3)= xy 2-x 2y18、2(2x-3y )-(3x+2y+1)=2x-8y-1 19、-(3a 2-4ab )+[a 2-2(2a+2ab )]=-2a 2-4a20、5m-7n-8p+5n-9m-p = -4m-2n-9p21、(5x 2y-7xy 2)-(xy 2-3x 2y )=4xy 2-4x 2y22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a]=-18a 2 +7a+223、3a 2-9a+5-(-7a 2+10a-5)=10a 2-19a+1024、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2)= -4a 2b-64ab 225、(5a-3a 2+1)-(4a 3-3a 2)=5a-4a 2+126、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]=7a 2+ab-2b 2 27、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=028、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x-25 29、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a+(4b-3a )-(-3a+b )= 5a+3b31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2)= 4a 2-ab32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].= -133、(2a 2-1+2a )-3(a-1+a 2)= -a 2-a+234、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)]=-2x 2+5xy-2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 = 31ab-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x-3y-138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a-4b+439、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y+441、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42、 3x -[5x +(3x -2)]=-5x+243、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x+y45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x+1 46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2)=a 2+9a-147、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).=3a 2b-ab 248、4a 2+2(3ab-2a 2)-(7ab-1)=1-ab49、 21xy+(-41xy )-2xy 2-(-3y 2x )=41xy+xy 2 50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a51、5m-7n-8p+5n-9m+8p=-4m-2n59、(7y-3z )-(8y-5z )=-y+2z60、-3(2x 2-xy )+4(x 2+xy-6)=-2x 2+7xy-24 61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)=0 62、-3x 2y+2x 2y+3xy 2-2xy 2 = -x 2y+xy 263、3(a 2-2ab )-2(-3ab+b 2)=3a 2-2b 264、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}=8abc-6a 2b+ab 265、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m66、-[2m-3(m-n+1)-2]-1=m-3n+467、31a-( 21a-4b-6c)+3(-2c+2b)= -61a+10b 68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、x 2y-3xy 2+2yx 2-y 2x=3x 2y-4xy 271、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2 = -41a 2b 71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}= 10a+9b-2c-672、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]= 2x 2-y 2 73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =698 74、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32. 原式=-3x+y 2=694 75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121; 原式=x 3+x 2-x+6=68376、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131 原式=5m-3n-1=577、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =2原式=-2ab 3+3ab 2=1278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3.原式=-2xyz=679、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.原式=-2x 2+x-6=-1680、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.(2x 2+xy+3y 2 ) ——( x 2-xy )= x 2+2xy+3y 281、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.( 2a 2-4ab+b 2 )—(-3a 2+2ab-5b 2)=5a 2 -6ab+6b 282、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.(5x 2y -2x 2y )+(-2xy 2+4x 2y )=3xy 2+2x 2y83、 求3x 2+x -5与4-x +7x 2的差.(3x 2+x -5)—(4-x +7x 2)=—4x 2+2x -984、计算 5y+3x+5z 2与12y+7x-3z 2的和(5y+3x+5z 2)+(12y+7x-3z 2)=17y+10x+2z 285、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差(8xy 2+3x 2y-2)—(-2x 2y+5xy 2-3)=5x 2y+3xy 2+186、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M23y 87、当3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值. 原式=-8xy+y= —1588、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41 原式=83abc-a 2b-2ab 2=3689、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2 (1)求A+B ;(2)求41(B-A); A+B=2a 2+2b 2 41(B-A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得 9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?A=10x 2+x+5 A+B=11x 2+4x+391、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .M-2N=5x 2-4x+392、已知222244,5A x xy y B x xy y =-+=+-,求3A -B3A -B=11x 2-13xy+8y 293、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .2A -3B= 5x 2+11xy +2y 294、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值. 原式=9ab 2-4a 2b=3495、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0. 原式=8abc-8a 2b=-3296、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值: 2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .原式=-5x 2y+5xyz=9097、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值. 原式=10a+10b-2ab=5098、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值原式=2m 2+6mn+5=1599、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值. B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A与B 的大小. A=2a 2-4a +1 B =2a 2-4a +3 所以A<B。

《整式的加减》专项练习100题(已排版好,可直接打印,有答案)

《整式的加减》专项练习100题(已排版好,可直接打印,有答案)

1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x2-xy+y)-3(x2+xy-2y)15、3x2-[7x-(4x-3)-2x2]16、a2b-[2(a2b-2a2c)-(2bc+a2c)];17、-2y3+(3xy2-x2y)-2(xy2-y3).18、2(2x-3y)-(3x+2y+1)19、-(3a2-4ab)+[a2-2(2a+2ab)].20、5m-7n-8p+5n-9m-p;21、(5x2y-7xy2)-(xy2-3x2y);22、3(-3a2-2a)-[a2-2(5a-4a2+1)-3a].23、3a2-9a+5-(-7a2+10a-5);24、-3a2b-(2ab2-a2b)-(2a2b+4ab2).25、(5a -3a 2+1)-(4a 3-3a 2);26、-2(ab -3a 2)-[2b 2-(5ab +a 2)+2ab]27、(8xy -x 2+y 2)+(-y 2+x 2-8xy );28、(2x 2-21+3x )-4(x -x 2+21); 29、3x 2-[7x -(4x -3)-2x 2].30、5a +(4b -3a )-(-3a +b );31、(3a2-3ab +2b2)+(a2+2ab -2b2);32、2a2b +2ab2-[2(a2b -1)+2ab2+2].33、(2a 2-1+2a )-3(a -1+a 2);34、2(x 2-xy )-3(2x 2-3xy ) -2[x 2-(2x 2-xy +y 2)].35、 -32ab +43a 2b +ab +(-43a 2b )-136、(8xy -x 2+y 2)+(-y 2+x 2-8xy );37、2x -(3x -2y +3)-(5y -2);38、-(3a +2b )+(4a -3b +1)-(2a -b-3)39、4x 3-(-6x 3)+(-9x 3)40、3-2xy +2yx 2+6xy -4x 2y41、1-3(2ab+a)十[1-2(2a-3ab)].42、3x-[5x+(3x-2)];43、(3a2b-ab2)-(ab2+3a2b)44、()[]{}yxxyx--+--3233245、(-x2+5+4x3)+(-x3+5x-4)46、(5a2-2a+3)-(1-2a+a2)+3(-1+3a-a2).47、5(3a2b-ab2)-4(-ab2+3a2b).48、4a2+2(3ab-2a2)-(7ab-1).49、 21xy +(-41xy )-2xy 2-(-3y 2x )50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m -7n -8p +5n -9m +8p52、(5x 2y -7xy 2)-(xy 2-3x 2y )53、 3x 2y -[2x 2y -3(2xy -x 2y )-xy]54、 3x 2-[5x -4(21x 2-1)]+5x 255、2a 3b - 21a 3b -a 2b + 21a 2b -ab 2;56、(a 2+4ab -4b 2)-3(a 2+b 2)-7(b 2-ab ).57、a2+2a3+(-2a3)+(-3a3)+3a2;58、5ab+(-4a2b2)+8ab2-(-3ab)+(-a2b)+4a2b2;59、(7y-3z)-(8y-5z);60、-3(2x2-xy)+4(x2+xy-6).61、(x3+3x2y-5xy2+9y3)+(-2y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)62、-3x2y+2x2y+3xy2-2xy2;63、3(a2-2ab)-2(-3ab+b2);64、5abc-{2a2b-[3abc-(4a2b-ab2]}.整式的加减专项练习100题(65-72) 65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )].66、-[2m -3(m -n +1)-2]-1.67、31a -(21a -4b -6c)+3(-2c +2b)68、 -5a n -a n -(-7a n )+(-3a n )69、x 2y -3xy 2+2yx 2-y 2x 70、 41a 2b -0.4ab 2- 21a 2b + 52ab 2;71、3a -{2c -[6a -(c -b )+c +(a +8b -6)]}72、-3(xy -2x 2)-[y 2-(5xy -4x 2)+2xy];整式的加减专项练习100题(73-76)73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m +n )-[1-(m -4n )],m=52 n=-13177、化简、求值2(a2b+2b3-ab3)+3a3-(2ba2-3ab2+3a3)-4b3,其中a=-3,b=278、化简,求值:(2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3),其中x=1,y=2,z=-3.79、化简,求值:5x2-[3x-2(2x-3)+7x2],其中x=-2.80、若两个多项式的和是2x2+xy+3y2,一个加式是x2-xy,求另一个加式.81、若2a2-4ab+b2与一个多项式的差是-3a2+2ab-5b2,试求这个多项式.82、求5x2y-2x2y与-2xy2+4x2y的和.83、求3x2+x-5与4-x+7x2的差.84、计算5y+3x+5z2与12y+7x-3z2的和85、计算8xy 2+3x 2y -2与-2x 2y +5xy 2-3的差86、 多项式-x 2+3xy -21y 与多项式M 的差是-21x 2-xy +y ,求多项式M87、当x=-21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y +2(xy +y )]的值.88、化简再求值5abc -{2a 2b -[3abc -(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189、已知A=a 2-2ab +b 2,B=a 2+2ab +b 2(1)求A +B ; (2)求41(B -A);90、小明同学做一道题,已知两个多项式A ,B ,计算A +B ,他误将A +B 看作A -B ,求得9x 2-2x +7,若B=x 2+3x -2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x -1,N=-x 2-2+3x ,求M -2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B93、已知A=x2+xy+y2,B=-3xy-x2,求2A-3B.94、已知2a+(b+1)2=0,求5ab2-[2a2b-(4ab2-2a2b)]的值.95、化简求值:5abc-2a2b+[3abc-2(4ab2-a2b)],其中a、b、c满足|a-1|+|b-2|+c2=0.96、已知a,b,z满足:(1)已知|x-2|+(y+3)2=0,(2)z是最大的负整数,化简求值:2(x2y+xyz)-3(x2y-xyz)-4x2y.97、已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值.98、已知m2+3mn=5,求5m2-[+5m2-(2m2-mn)-7mn-5]的值99、设A=2x2-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若|x-2a|+(y-3)2=0,且B-2A=a,求a的值.100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A与B的大小.答案:1-161、3(a+5b)-2(b-a)=5a+13b2、3a-(2b-a)+b=4a-b.3、2(2a2+9b)+3(-5a2-4b)=—11a2+6b4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)= -2x3+y3+4x2y5、3x2-[7x-(4x-3)-2x2] = 5x2 -3x-36、(2xy-y)-(-y+yx)= xy7、5(a2b-3ab2)-2(a2b-7ab)= -a2b+11ab8、(-2ab+3a)-2(2a-b)+2ab= -2a+b※※※※※※※※※※※※※※※※※※※※※※※※9、(7m2n-5mn)-(4m2n-5mn)= 3m2n10、(5a2+2a-1)-4(3-8a+2a2)= -3a2+34a-1311、-3x2y+3xy2+2x2y-2xy2= -x2y+xy212、2(a-1)-(2a-3)+3.=413、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]= 7a2+ab-2b214、(x2-xy+y)-3(x2+xy-2y)= -2x2-4xy+7y15、3x2-[7x-(4x-3)-2x2]=5x2-3x-316、a2b-[2(a2b-2a2c)-(2bc+a2c)]= -a2b+2bc+5a2c※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ 答案:17-32※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3)= xy 2-x 2y18、2(2x -3y )-(3x +2y +1)=2x -8y -119、-(3a 2-4ab )+[a 2-2(2a +2ab )]=-2a 2-4a20、5m -7n -8p +5n -9m -p = -4m -2n -9p21、(5x 2y -7xy 2)-(xy 2-3x 2y )=4xy 2-4x 2y22、3(-3a 2-2a )-[a 2-2(5a -4a 2+1)-3a]=-18a 2 +7a +223、3a 2-9a +5-(-7a 2+10a -5)=10a 2-19a +1024、-3a 2b -(2ab 2-a 2b )-(2a 2b +4ab 2)= -4a 2b -64ab 2※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※25、(5a -3a 2+1)-(4a 3-3a 2)=5a -4a 2+126、-2(ab -3a 2)-[2b 2-(5ab +a 2)+2ab]=7a 2+ab -2b 227、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=028、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x -2529、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a +(4b -3a )-(-3a +b )= 5a +3b31、(3a 2-3ab +2b 2)+(a 2+2ab -2b 2)= 4a 2-ab32、2a 2b +2ab 2-[2(a 2b -1)+2ab 2+2].= -1※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※33、(2a 2-1+2a )-3(a -1+a 2)= -a 2-a +234、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy +y 2)]=-2x 2+5xy -2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 =31ab -1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x -3y -138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a -4b +439、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y +4※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ 41、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42、 3x -[5x +(3x -2)]=-5x +243、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x +y 45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x +146、(5a 2-2a +3)-(1-2a +a 2)+3(-1+3a -a 2)=a 2+9a -147、5(3a 2b -ab 2)-4(-ab 2+3a 2b ).=3a 2b -ab 248、4a 2+2(3ab -2a 2)-(7ab -1)=1-ab※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※49、 21xy +(-41xy )-2xy 2-(-3y 2x )=41xy +xy 2 50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a51、5m -7n -8p +5n -9m +8p=-4m -2n52、(5x 2y -7xy 2)-(xy 2-3x 2y )=8x 2y -6xy 253、 3x 2y -[2x 2y -3(2xy -x 2y )-xy]=-2x 2y +7xy 54、 3x 2-[5x -4( 21x 2-1)]+5x 2 = 10x 2-5x -4 55、2a 3b - 21a 3b -a 2b + 21a 2b -ab 2 = 23a 3b - 21a 2b -ab 2 56、(a 2+4ab -4b 2)-3(a 2+b 2)-7(b 2-ab )=-2a 2+11ab -14b 2※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※57、a 2+2a 3+(-2a 3)+(-3a 3)+3a 2 = -3a 3+4a 258、5ab +(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2=8ab +8ab 2-a 2b59、(7y -3z )-(8y -5z )=-y +2z60、-3(2x 2-xy )+4(x 2+xy -6)=-2x 2+7xy -2461、(x 3+3x 2y -5xy 2+9y 3)+(-2y 3+2xy 2+x 2y -2x 3)-(4x 2y -x 3-3xy 2+7y 3)=062、-3x 2y +2x 2y +3xy 2-2xy 2 = -x 2y +xy 263、3(a 2-2ab )-2(-3ab +b 2)=3a 2-2b 264、5abc -{2a 2b -[3abc -(4a 2b -ab 2]}=8abc -6a 2b +ab 2※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ 65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m 66、-[2m -3(m -n +1)-2]-1=m -3n +4 67、31a -(21a -4b -6c)+3(-2c +2b)= -61a +10b 68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、x 2y -3xy 2+2yx 2-y 2x=3x 2y -4xy 2 71、41a 2b -0.4ab 2- 21a 2b + 52ab 2 = -41a 2b 71、3a -{2c -[6a -(c -b )+c +(a +8b -6)]}= 10a +9b -2c -6 72、-3(xy -2x 2)-[y 2-(5xy -4x 2)+2xy]= 2x 2-y 2※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =69874、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32. 原式=-3x +y 2=69475、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;原式=x 3+x 2-x +6=68376、 化简,求值(4m +n )-[1-(m -4n )],m=52 n=-131 原式=5m -3n -1=5※※※※※※※※※※※※※※※※※※※※※※※※77、化简、求值2(a2b+2b3-ab3)+3a3-(2ba2-3ab2+3a3)-4b3,其中a=-3,b=2原式=-2ab3+3ab2=1278、化简,求值:(2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3),其中x=1,y=2,z=-3.原式=-2xyz=679、化简,求值:5x2-[3x-2(2x-3)+7x2],其中x=-2.原式=-2x2+x-6=-1680、若两个多项式的和是2x2+xy+3y2,一个加式是x2-xy,求另一个加式.(2x2+xy+3y2 )——(x2-xy)= x2+2xy+3y2※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※81、若2a2-4ab+b2与一个多项式的差是-3a2+2ab-5b2,试求这个多项式.(2a2-4ab+b2)—(-3a2+2ab-5b2)=5a2 -6ab+6b282、求5x2y-2x2y与-2xy2+4x2y的和.(5x2y-2x2y)+(-2xy2+4x2y)=3xy2+2x2y83、求3x2+x-5与4-x+7x2的差.(3x2+x-5)—(4-x+7x2)=—4x2+2x-984、计算5y+3x+5z2与12y+7x-3z2的和(5y+3x+5z2)+(12y+7x-3z2)=17y+10x+2z2※※※※※※※※※※※※※※※※※※※※※※※※答案:85-92※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ 85、计算8xy 2+3x 2y -2与-2x 2y +5xy 2-3的差(8xy 2+3x 2y -2)—(-2x 2y +5xy 2-3)=5x 2y +3xy 2+186、 多项式-x 2+3xy -21y 与多项式M 的差是-21x 2-xy +y ,求多项式MM=-21x 2+4xy —23y87、当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y +2(xy +y )]的值.原式=-8xy +y= —1588、化简再求值5abc -{2a 2b -[3abc -(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41原式=83abc -a 2b -2ab 2=36※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ 89、已知A=a 2-2ab +b 2,B=a 2+2ab +b 2 (1)求A +B ; (2)求41(B -A); A +B=2a 2+2b 241(B -A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A +B ,他误将A +B 看作A -B ,求得9x 2-2x +7,若B=x 2+3x -2,你能否帮助小明同学求得正确答案? A=10x 2+x +5 A +B=11x 2+4x +391、已知:M=3x 2+2x -1,N=-x 2-2+3x ,求M -2N . M -2N=5x 2-4x +392、已知222244,5A x xy y B x xy y =-+=+-,求3A -B 3A -B=11x 2-13xy +8y 2答案:93-100 ※※※※※※※※※※※※※※※※※※93、已知A=x2+xy+y2,B=-3xy-x2,求2A-3B.2A-3B= 5x2+11xy+2y294、已知2a+(b+1)2=0,求5ab2-[2a2b-(4ab2-2a2b)]的值.原式=9ab2-4a2b=3495、化简求值:5abc-2a2b+[3abc-2(4ab2-a2b)],其中a、b、c满足|a-1|+|b-2|+c2=0.原式=8abc-8a2b=-3296、已知a,b,z满足:(1)已知|x-2|+(y+3)2=0,(2)z是最大的负整数,化简求值:2(x2y+xyz)-3(x2y-xyz)-4x2y.原式=-5x2y+5xyz=90※※※※※※※※※※※※※※※※※※※※※※※※97、已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值.原式=10a+10b-2ab=5098、已知m2+3mn=5,求5m2-[+5m2-(2m2-mn)-7mn-5]的值原式=2m2+6mn+5=1599、设A=2x2-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若|x-2a|+(y-3)2=0,且B-2A=a,求a 的值.B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A与B的大小.A=2a2-4a+1 B=2a2-4a+3 所以A<B。

《整式的加减》专项练习100题(已排版好,可直接打印,有答案)

《整式的加减》专项练习100题(已排版好,可直接打印,有答案)

1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x2-xy+y)-3(x2+xy-2y)15、3x2-[7x-(4x-3)-2x2]16、a2b-[2(a2b-2a2c)-(2bc+a2c)];17、-2y3+(3xy2-x2y)-2(xy2-y3).18、2(2x-3y)-(3x+2y+1)19、-(3a2-4ab)+[a2-2(2a+2ab)].20、5m-7n-8p+5n-9m-p;21、(5x2y-7xy2)-(xy2-3x2y);22、3(-3a2-2a)-[a2-2(5a-4a2+1)-3a].23、3a2-9a+5-(-7a2+10a-5);24、-3a2b-(2ab2-a2b)-(2a2b+4ab2).25、(5a -3a 2+1)-(4a 3-3a 2);26、-2(ab -3a 2)-[2b 2-(5ab +a 2)+2ab]27、(8xy -x 2+y 2)+(-y 2+x 2-8xy );28、(2x 2-21+3x )-4(x -x 2+21); 29、3x 2-[7x -(4x -3)-2x 2].30、5a +(4b -3a )-(-3a +b );31、(3a2-3ab +2b2)+(a2+2ab -2b2);32、2a2b +2ab2-[2(a2b -1)+2ab2+2].33、(2a 2-1+2a )-3(a -1+a 2);34、2(x 2-xy )-3(2x 2-3xy ) -2[x 2-(2x 2-xy +y 2)].35、 -32ab +43a 2b +ab +(-43a 2b )-136、(8xy -x 2+y 2)+(-y 2+x 2-8xy );37、2x -(3x -2y +3)-(5y -2);38、-(3a +2b )+(4a -3b +1)-(2a -b-3)39、4x 3-(-6x 3)+(-9x 3)40、3-2xy +2yx 2+6xy -4x 2y41、1-3(2ab+a)十[1-2(2a-3ab)].42、3x-[5x+(3x-2)];43、(3a2b-ab2)-(ab2+3a2b)44、()[]{}yxxyx--+--3233245、(-x2+5+4x3)+(-x3+5x-4)46、(5a2-2a+3)-(1-2a+a2)+3(-1+3a-a2).47、5(3a2b-ab2)-4(-ab2+3a2b).48、4a2+2(3ab-2a2)-(7ab-1).49、 21xy +(-41xy )-2xy 2-(-3y 2x )50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m -7n -8p +5n -9m +8p52、(5x 2y -7xy 2)-(xy 2-3x 2y )53、 3x 2y -[2x 2y -3(2xy -x 2y )-xy]54、 3x 2-[5x -4(21x 2-1)]+5x 255、2a 3b - 21a 3b -a 2b + 21a 2b -ab 2;56、(a 2+4ab -4b 2)-3(a 2+b 2)-7(b 2-ab ).57、a2+2a3+(-2a3)+(-3a3)+3a2;58、5ab+(-4a2b2)+8ab2-(-3ab)+(-a2b)+4a2b2;59、(7y-3z)-(8y-5z);60、-3(2x2-xy)+4(x2+xy-6).61、(x3+3x2y-5xy2+9y3)+(-2y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)62、-3x2y+2x2y+3xy2-2xy2;63、3(a2-2ab)-2(-3ab+b2);64、5abc-{2a2b-[3abc-(4a2b-ab2]}.整式的加减专项练习100题(65-72) 65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )].66、-[2m -3(m -n +1)-2]-1.67、31a -(21a -4b -6c)+3(-2c +2b)68、 -5a n -a n -(-7a n )+(-3a n )69、x 2y -3xy 2+2yx 2-y 2x 70、 41a 2b -0.4ab 2- 21a 2b + 52ab 2;71、3a -{2c -[6a -(c -b )+c +(a +8b -6)]}72、-3(xy -2x 2)-[y 2-(5xy -4x 2)+2xy];整式的加减专项练习100题(73-76)73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m +n )-[1-(m -4n )],m=52 n=-13177、化简、求值2(a2b+2b3-ab3)+3a3-(2ba2-3ab2+3a3)-4b3,其中a=-3,b=278、化简,求值:(2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3),其中x=1,y=2,z=-3.79、化简,求值:5x2-[3x-2(2x-3)+7x2],其中x=-2.80、若两个多项式的和是2x2+xy+3y2,一个加式是x2-xy,求另一个加式.81、若2a2-4ab+b2与一个多项式的差是-3a2+2ab-5b2,试求这个多项式.82、求5x2y-2x2y与-2xy2+4x2y的和.83、求3x2+x-5与4-x+7x2的差.84、计算5y+3x+5z2与12y+7x-3z2的和85、计算8xy 2+3x 2y -2与-2x 2y +5xy 2-3的差86、 多项式-x 2+3xy -21y 与多项式M 的差是-21x 2-xy +y ,求多项式M87、当x=-21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y +2(xy +y )]的值.88、化简再求值5abc -{2a 2b -[3abc -(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189、已知A=a 2-2ab +b 2,B=a 2+2ab +b 2(1)求A +B ; (2)求41(B -A);90、小明同学做一道题,已知两个多项式A ,B ,计算A +B ,他误将A +B 看作A -B ,求得9x 2-2x +7,若B=x 2+3x -2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x -1,N=-x 2-2+3x ,求M -2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B93、已知A=x2+xy+y2,B=-3xy-x2,求2A-3B.94、已知2a+(b+1)2=0,求5ab2-[2a2b-(4ab2-2a2b)]的值.95、化简求值:5abc-2a2b+[3abc-2(4ab2-a2b)],其中a、b、c满足|a-1|+|b-2|+c2=0.96、已知a,b,z满足:(1)已知|x-2|+(y+3)2=0,(2)z是最大的负整数,化简求值:2(x2y+xyz)-3(x2y-xyz)-4x2y.97、已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值.98、已知m2+3mn=5,求5m2-[+5m2-(2m2-mn)-7mn-5]的值99、设A=2x2-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若|x-2a|+(y-3)2=0,且B-2A=a,求a的值.100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A与B的大小.答案:1-161、3(a+5b)-2(b-a)=5a+13b2、3a-(2b-a)+b=4a-b.3、2(2a2+9b)+3(-5a2-4b)=—11a2+6b4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)= -2x3+y3+4x2y5、3x2-[7x-(4x-3)-2x2] = 5x2 -3x-36、(2xy-y)-(-y+yx)= xy7、5(a2b-3ab2)-2(a2b-7ab)= -a2b+11ab8、(-2ab+3a)-2(2a-b)+2ab= -2a+b※※※※※※※※※※※※※※※※※※※※※※※※9、(7m2n-5mn)-(4m2n-5mn)= 3m2n10、(5a2+2a-1)-4(3-8a+2a2)= -3a2+34a-1311、-3x2y+3xy2+2x2y-2xy2= -x2y+xy212、2(a-1)-(2a-3)+3.=413、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]= 7a2+ab-2b214、(x2-xy+y)-3(x2+xy-2y)= -2x2-4xy+7y15、3x2-[7x-(4x-3)-2x2]=5x2-3x-316、a2b-[2(a2b-2a2c)-(2bc+a2c)]= -a2b+2bc+5a2c※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ 答案:17-32※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3)= xy 2-x 2y18、2(2x -3y )-(3x +2y +1)=2x -8y -119、-(3a 2-4ab )+[a 2-2(2a +2ab )]=-2a 2-4a20、5m -7n -8p +5n -9m -p = -4m -2n -9p21、(5x 2y -7xy 2)-(xy 2-3x 2y )=4xy 2-4x 2y22、3(-3a 2-2a )-[a 2-2(5a -4a 2+1)-3a]=-18a 2 +7a +223、3a 2-9a +5-(-7a 2+10a -5)=10a 2-19a +1024、-3a 2b -(2ab 2-a 2b )-(2a 2b +4ab 2)= -4a 2b -64ab 2※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※25、(5a -3a 2+1)-(4a 3-3a 2)=5a -4a 2+126、-2(ab -3a 2)-[2b 2-(5ab +a 2)+2ab]=7a 2+ab -2b 227、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=028、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x -2529、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a +(4b -3a )-(-3a +b )= 5a +3b31、(3a 2-3ab +2b 2)+(a 2+2ab -2b 2)= 4a 2-ab32、2a 2b +2ab 2-[2(a 2b -1)+2ab 2+2].= -1※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※33、(2a 2-1+2a )-3(a -1+a 2)= -a 2-a +234、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy +y 2)]=-2x 2+5xy -2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 =31ab -1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x -3y -138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a -4b +439、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y +4※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ 41、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42、 3x -[5x +(3x -2)]=-5x +243、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x +y 45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x +146、(5a 2-2a +3)-(1-2a +a 2)+3(-1+3a -a 2)=a 2+9a -147、5(3a 2b -ab 2)-4(-ab 2+3a 2b ).=3a 2b -ab 248、4a 2+2(3ab -2a 2)-(7ab -1)=1-ab※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※49、 21xy +(-41xy )-2xy 2-(-3y 2x )=41xy +xy 2 50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a51、5m -7n -8p +5n -9m +8p=-4m -2n52、(5x 2y -7xy 2)-(xy 2-3x 2y )=8x 2y -6xy 253、 3x 2y -[2x 2y -3(2xy -x 2y )-xy]=-2x 2y +7xy 54、 3x 2-[5x -4( 21x 2-1)]+5x 2 = 10x 2-5x -4 55、2a 3b - 21a 3b -a 2b + 21a 2b -ab 2 = 23a 3b - 21a 2b -ab 2 56、(a 2+4ab -4b 2)-3(a 2+b 2)-7(b 2-ab )=-2a 2+11ab -14b 2※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※57、a 2+2a 3+(-2a 3)+(-3a 3)+3a 2 = -3a 3+4a 258、5ab +(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2=8ab +8ab 2-a 2b59、(7y -3z )-(8y -5z )=-y +2z60、-3(2x 2-xy )+4(x 2+xy -6)=-2x 2+7xy -2461、(x 3+3x 2y -5xy 2+9y 3)+(-2y 3+2xy 2+x 2y -2x 3)-(4x 2y -x 3-3xy 2+7y 3)=062、-3x 2y +2x 2y +3xy 2-2xy 2 = -x 2y +xy 263、3(a 2-2ab )-2(-3ab +b 2)=3a 2-2b 264、5abc -{2a 2b -[3abc -(4a 2b -ab 2]}=8abc -6a 2b +ab 2※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ 65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m 66、-[2m -3(m -n +1)-2]-1=m -3n +4 67、31a -(21a -4b -6c)+3(-2c +2b)= -61a +10b 68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、x 2y -3xy 2+2yx 2-y 2x=3x 2y -4xy 2 71、41a 2b -0.4ab 2- 21a 2b + 52ab 2 = -41a 2b 71、3a -{2c -[6a -(c -b )+c +(a +8b -6)]}= 10a +9b -2c -6 72、-3(xy -2x 2)-[y 2-(5xy -4x 2)+2xy]= 2x 2-y 2※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =69874、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32. 原式=-3x +y 2=69475、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;原式=x 3+x 2-x +6=68376、 化简,求值(4m +n )-[1-(m -4n )],m=52 n=-131 原式=5m -3n -1=5※※※※※※※※※※※※※※※※※※※※※※※※77、化简、求值2(a2b+2b3-ab3)+3a3-(2ba2-3ab2+3a3)-4b3,其中a=-3,b=2原式=-2ab3+3ab2=1278、化简,求值:(2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3),其中x=1,y=2,z=-3.原式=-2xyz=679、化简,求值:5x2-[3x-2(2x-3)+7x2],其中x=-2.原式=-2x2+x-6=-1680、若两个多项式的和是2x2+xy+3y2,一个加式是x2-xy,求另一个加式.(2x2+xy+3y2 )——(x2-xy)= x2+2xy+3y2※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※81、若2a2-4ab+b2与一个多项式的差是-3a2+2ab-5b2,试求这个多项式.(2a2-4ab+b2)—(-3a2+2ab-5b2)=5a2 -6ab+6b282、求5x2y-2x2y与-2xy2+4x2y的和.(5x2y-2x2y)+(-2xy2+4x2y)=3xy2+2x2y83、求3x2+x-5与4-x+7x2的差.(3x2+x-5)—(4-x+7x2)=—4x2+2x-984、计算5y+3x+5z2与12y+7x-3z2的和(5y+3x+5z2)+(12y+7x-3z2)=17y+10x+2z2※※※※※※※※※※※※※※※※※※※※※※※※答案:85-92※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ 85、计算8xy 2+3x 2y -2与-2x 2y +5xy 2-3的差(8xy 2+3x 2y -2)—(-2x 2y +5xy 2-3)=5x 2y +3xy 2+186、 多项式-x 2+3xy -21y 与多项式M 的差是-21x 2-xy +y ,求多项式MM=-21x 2+4xy —23y87、当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y +2(xy +y )]的值.原式=-8xy +y= —1588、化简再求值5abc -{2a 2b -[3abc -(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41原式=83abc -a 2b -2ab 2=36※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ ※※※※※※ 89、已知A=a 2-2ab +b 2,B=a 2+2ab +b 2 (1)求A +B ; (2)求41(B -A); A +B=2a 2+2b 241(B -A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A +B ,他误将A +B 看作A -B ,求得9x 2-2x +7,若B=x 2+3x -2,你能否帮助小明同学求得正确答案? A=10x 2+x +5 A +B=11x 2+4x +391、已知:M=3x 2+2x -1,N=-x 2-2+3x ,求M -2N . M -2N=5x 2-4x +392、已知222244,5A x xy y B x xy y =-+=+-,求3A -B 3A -B=11x 2-13xy +8y 2答案:93-100 ※※※※※※※※※※※※※※※※※※93、已知A=x2+xy+y2,B=-3xy-x2,求2A-3B.2A-3B= 5x2+11xy+2y294、已知2a+(b+1)2=0,求5ab2-[2a2b-(4ab2-2a2b)]的值.原式=9ab2-4a2b=3495、化简求值:5abc-2a2b+[3abc-2(4ab2-a2b)],其中a、b、c满足|a-1|+|b-2|+c2=0.原式=8abc-8a2b=-3296、已知a,b,z满足:(1)已知|x-2|+(y+3)2=0,(2)z是最大的负整数,化简求值:2(x2y+xyz)-3(x2y-xyz)-4x2y.原式=-5x2y+5xyz=90※※※※※※※※※※※※※※※※※※※※※※※※97、已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值.原式=10a+10b-2ab=5098、已知m2+3mn=5,求5m2-[+5m2-(2m2-mn)-7mn-5]的值原式=2m2+6mn+5=1599、设A=2x2-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若|x-2a|+(y-3)2=0,且B-2A=a,求a 的值.B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A与B的大小.A=2a2-4a+1 B=2a2-4a+3 所以A<B。

《整式的加减》专项练习100题(有答案)

《整式的加减》专项练习100题(有答案)

整式の加减专项练习100题(有答案)1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x 2-xy+y )-3(x 2+xy-2y )15、3x 2-[7x-(4x-3)-2x 2]16、a 2b-[2(a 2b-2a 2c )-(2bc+a 2c )];17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3).18、2(2x-3y )-(3x+2y+1)19、-(3a 2-4ab )+[a 2-2(2a+2ab )].20、5m-7n-8p+5n-9m-p ;21、(5x 2y-7xy 2)-(xy 2-3x 2y );22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a].23、3a 2-9a+5-(-7a 2+10a-5);24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2).25、(5a-3a 2+1)-(4a 3-3a 2);26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]27、(8xy -x 2+y 2)+(-y 2+x 2-8xy );28、(2x 2-21+3x )-4(x -x 2+21);29、3x 2-[7x -(4x -3)-2x 2].30、5a+(4b-3a )-(-3a+b );31、(3a2-3ab+2b2)+(a2+2ab-2b2);32、2a2b+2ab2-[2(a2b-1)+2ab2+2].33、(2a 2-1+2a )-3(a-1+a 2);34、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)].35、 -32ab +43a 2b +ab +(-43a 2b )-136、(8xy -x 2+y 2)+(-y 2+x 2-8xy );37、2x -(3x -2y +3)-(5y -2);38、-(3a +2b )+(4a -3b +1)-(2a -b -3)39、4x 3-(-6x 3)+(-9x 3)40、3-2xy +2yx 2+6xy -4x 2y41、 1-3(2ab +a )十[1-2(2a -3ab )].42、 3x -[5x +(3x -2)];43、(3a 2b -ab 2)-(ab 2+3a 2b )44、()[]{}y x x y x --+--3233245、(-x 2+5+4x 3)+(-x 3+5x -4)46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2).47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).48、4a 2+2(3ab-2a 2)-(7ab-1).49、21xy+(-41xy )-2xy 2-(-3y 2x )50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m-7n-8p+5n-9m+8p52、(5x 2y-7xy 2)-(xy 2-3x 2y )53、 3x 2y-[2x 2y-3(2xy-x 2y )-xy]54、 3x 2-[5x-4(21x 2-1)]+5x 255、2a 3b-21a 3b-a 2b+21a 2b-ab 2;56、(a 2+4ab-4b 2)-3(a 2+b 2)-7(b 2-ab ).57、a 2+2a 3+(-2a 3)+(-3a 3)+3a 2;58、5ab+(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2;59、(7y-3z )-(8y-5z );60、-3(2x 2-xy )+4(x 2+xy-6).61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)62、-3x 2y+2x 2y+3xy 2-2xy 2;63、3(a 2-2ab )-2(-3ab+b 2);64、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}.65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )].66、-[2m-3(m-n+1)-2]-1.67、31a-( 21a-4b-6c)+3(-2c+2b)68、 -5a n-a n-(-7a n)+(-3a n)69、x 2y-3xy 2+2yx 2-y 2x70、41a 2b-0.4ab 2-21a 2b+52ab 2;71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}72、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy];73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32. 75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-13177、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3.79、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.80、若两个多项式の和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.81、若2a 2-4ab+b 2与一个多项式の差是-3a 2+2ab-5b 2,试求这个多项式.82、求5x 2y -2x 2y 与-2xy 2+4x 2y の和.83、 求3x 2+x -5与4-x +7x 2の差.84、计算 5y+3x+5z 2与12y+7x-3z 2の和85、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3の差86、 多项式-x 2+3xy-21y 与多项式M の差是-21x 2-xy+y ,求多项式M87、当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]の值.88、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ; (2)求41(B-A);90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B93、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .94、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]の值.95、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0.96、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大の负整数,化简求值: 2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .97、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )の值.98、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]の值99、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求aの值.100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A 与Bの大小.答案:1、3(a+5b)-2(b-a)=5a+13b2、3a-(2b-a)+b=4a-b.3、2(2a2+9b)+3(-5a2-4b)=—11a2+6b24、(x3-2y3-3x2y)-(3x3-3y3-7x2y)= -2x3+y3+4x2y5、3x2-[7x-(4x-3)-2x2] = 5x2 -3x-36、(2xy-y)-(-y+yx)= xy7、5(a22b-3ab2)-2(a2b-7ab)= -a2b+11ab8、(-2ab+3a)-2(2a-b)+2ab= -2a+b9、(7m2n-5mn)-(4m2n-5mn)= 3m2n10、(5a2+2a-1)-4(3-8a+2a2)= -3a2+34a-1311、-3x2y+3xy2+2x2y-2xy2= -x2y+xy212、2(a-1)-(2a-3)+3.=413、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]= 7a2+ab-2b214、(x2-xy+y)-3(x2+xy-2y)= -2x2-4xy+7y15、3x2-[7x-(4x-3)-2x2]=5x2-3x-316、a2b-[2(a2b-2a2c)-(2bc+a2c)]= -a2b+2bc+6a2c17、-2y3+(3xy2-x2y)-2(xy2-y3)= xy2-x2y18、2(2x-3y)-(3x+2y+1)=2x-8y-119、-(3a2-4ab)+[a2-2(2a+2ab)]=-2a2-4a20、5m-7n-8p+5n-9m-p = -4m-2n-9p21、(5x2y-7xy2)-(xy2-3x2y)=4xy2-4x2y22、3(-3a2-2a)-[a2-2(5a-4a2+1)-3a]=-18a2 +7a+223、3a2-9a+5-(-7a2+10a-5)=10a2-19a+1024、-3a2b-(2ab2-a2b)-(2a2b+4ab2)= -4a2b-64ab225、(5a-3a 2+1)-(4a 3-3a 2)=5a-4a 2+126、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]=7a 2+ab-2b 227、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=0 28、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x-25 29、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a+(4b-3a )-(-3a+b )= 5a+3b31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2)= 4a 2-ab 32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].= -133、(2a 2-1+2a )-3(a-1+a 2)= -a 2-a+234、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)]=-2x 2+5xy-2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 = 31ab-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x-3y-138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a-4b+4 39、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y+4 41、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42、 3x -[5x +(3x -2)]=-5x+243、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x+y 45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x+1 46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2)=a 2+9a-1 47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).=3a 2b-ab 248、4a 2+2(3ab-2a 2)-(7ab-1)=1-ab 49、21xy+(-41xy )-2xy 2-(-3y 2x )=41xy+xy 250、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a 51、5m-7n-8p+5n-9m+8p=-4m-2n 52、(5x 2y-7xy 2)-(xy 2-3x 2y )=8x 2y-6xy253、 3x 2y-[2x 2y-3(2xy-x 2y )-xy]=-2x 2y+7xy54、 3x 2-[5x-4( 21x 2-1)]+5x 2 = 10x 2-5x-4 55、2a 3b-21a 3b-a 2b+ 21a 2b-ab 2 = 23a 3b- 21a 2b-ab 2 56、(a 2+4ab-4b 2)-3(a 2+b 2)-7(b 2-ab )=-2a 2+11ab-14b 257、a 2+2a 3+(-2a 3)+(-3a 3)+3a 2 = -3a 3+4a 258、5ab+(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2=8ab+8ab 2-a 2b59、(7y-3z )-(8y-5z )=-y+2z60、-3(2x 2-xy )+4(x 2+xy-6)=-2x 2+7xy-24 61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)=062、-3x 2y+2x 2y+3xy 2-2xy 2 = -x 2y+xy 263、3(a 2-2ab )-2(-3ab+b 2)=3a 2-2b 264、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}=8abc-6a 2b+ab 265、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m66、-[2m-3(m-n+1)-2]-1=m-3n+4 67、31a-( 21a-4b-6c)+3(-2c+2b)= -61a+10b 68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、x 2y-3xy 2+2yx 2-y 2x=3x 2y-4xy 271、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2 = -41a 2b71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}= 10a+9b-2c-672、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]= 2x 2-y 2 73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =698 74、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32. 原式=-3x+y 2=694 75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121; 原式=x 3+x 2-x+6=68376、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131 原式=5m-3n-1=577、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =2原式=-2ab 3+3ab 2=1278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3. 原式=-2xyz=679、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2. 原式=-2x 2+x-6=-1680、若两个多项式の和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.(2x 2+xy+3y 2 ) ——( x 2-xy )= x 2+2xy+3y 281、若2a 2-4ab+b 2与一个多项式の差是-3a 2+2ab-5b 2,试求这个多项式.( 2a 2-4ab+b 2 )—(-3a 2+2ab-5b 2)=5a 2 -6ab+6b 282、求5x 2y -2x 2y 与-2xy 2+4x 2y の和.(5x 2y -2x 2y )+(-2xy 2+4x 2y )=3xy 2+2x 2y83、 求3x 2+x -5与4-x +7x 2の差.(3x 2+x -5)—(4-x +7x 2)=—4x 2+2x -9 84、计算 5y+3x+5z 2与12y+7x-3z 2の和(5y+3x+5z 2)+(12y+7x-3z 2)=17y+10x+2z 285、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3の差(8xy 2+3x 2y-2)—(-2x 2y+5xy 2-3)=5x 2y+3xy 2+1 86、 多项式-x 2+3xy-21y 与多项式M の差是-21x 2-xy+y ,求多项式M M=-21x 2+4xy —23y 87、当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]の值. 原式=-8xy+y= —1588、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41 原式=83abc-a 2b-2ab 2=3689、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ;(2)求41(B-A); A+B=2a 2+2b 2 41(B-A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得 9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?A=10x 2+x+5 A+B=11x 2+4x+391、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .M-2N=5x 2-4x+3 92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B3A -B=11x 2-13xy+8y 293、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .2A -3B= 5x 2+11xy +2y 294、已知2 a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]の值.原式=9ab 2-4a 2b=3495、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0. 原式=8abc-8a 2b=-32 96、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大の负整数,化简求值: 2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .原式=-5x 2y+5xyz=9097、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )の值. 原式=10a+10b-2ab=5098、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]の值原式=2m 2+6mn+5=15 99、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a の值.B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A 与B の大小.A=2a 2-4a +1 B =2a 2-4a +3 所以A<B。

(完整word版)《整式的加减》专项练习100题(有答案)

(完整word版)《整式的加减》专项练习100题(有答案)

整式的加减专项练习100题(有答案)1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x2-xy+y)-3(x2+xy-2y)15、3x2-[7x-(4x-3)-2x2]16、a2b-[2(a2b-2a2c)-(2bc+a2c)];17、-2y3+(3xy2-x2y)-2(xy2-y3).18、2(2x-3y)-(3x+2y+1)19、-(3a2-4ab)+[a2-2(2a+2ab)].20、5m-7n-8p+5n-9m-p;21、(5x2y-7xy2)-(xy2-3x2y);22、3(-3a2-2a)-[a2-2(5a-4a2+1)-3a].23、3a2-9a+5-(-7a2+10a-5);24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2).25、(5a-3a 2+1)-(4a 3-3a 2);26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]27、(8xy -x 2+y 2)+(-y 2+x 2-8xy );28、(2x 2-21+3x )-4(x -x 2+21);29、3x 2-[7x -(4x -3)-2x 2].30、5a+(4b-3a )-(-3a+b );31、(3a2-3ab+2b2)+(a2+2ab-2b2);32、2a2b+2ab2-[2(a2b-1)+2ab2+2].33、(2a 2-1+2a )-3(a-1+a 2);34、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)].35、 -32ab +43a 2b +ab +(-43a 2b )-136、(8xy -x 2+y 2)+(-y 2+x 2-8xy );37、2x -(3x -2y +3)-(5y -2);38、-(3a +2b )+(4a -3b +1)-(2a -b -3)39、4x 3-(-6x 3)+(-9x 3)40、3-2xy +2yx 2+6xy -4x 2y41、 1-3(2ab +a )十[1-2(2a -3ab )].42、 3x -[5x +(3x -2)];43、(3a 2b -ab 2)-(ab 2+3a 2b )44、()[]{}y x x y x --+--3233245、(-x 2+5+4x 3)+(-x 3+5x -4)46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2).47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).48、4a 2+2(3ab-2a 2)-(7ab-1).49、21xy+(-41xy )-2xy 2-(-3y 2x )50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m-7n-8p+5n-9m+8p52、(5x 2y-7xy 2)-(xy 2-3x 2y )53、 3x 2y-[2x 2y-3(2xy-x 2y )-xy]54、 3x 2-[5x-4(21x 2-1)]+5x 255、2a 3b- 21a 3b-a 2b+21a 2b-ab 2;56、(a 2+4ab-4b 2)-3(a 2+b 2)-7(b 2-ab ).57、a 2+2a 3+(-2a 3)+(-3a 3)+3a 2;58、5ab+(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2;59、(7y-3z )-(8y-5z );60、-3(2x 2-xy )+4(x 2+xy-6).61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)62、-3x 2y+2x 2y+3xy 2-2xy 2;63、3(a 2-2ab )-2(-3ab+b 2);64、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}.65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )].66、-[2m-3(m-n+1)-2]-1. 67、31a-( 21a-4b-6c)+3(-2c+2b) 68, -5a n -a n -(-7a n )+(-3a n )69、x 2y-3xy 2+2yx 2-y 2x 70, 41a 2b-0.4ab 2-21a 2b+52ab 2;71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]} 72、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy];73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-13177、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =78、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3.79、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.80、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.81、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.82、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和. 83、 求3x 2+x -5与4-x +7x 2的差.84、计算 5y+3x+5z2与12y+7x-3z2的和 85、计算8xy2+3x2y-2与-2x2y+5xy2-3的差86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M87、当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.88,化简再求值5abc-{2a 2b-[3abc-(4ab2-a2b )]-2ab2},其中a=-2,b=3,c=-4189、已知A=a2-2ab+b2,B=a2+2ab+b2(1)求A+B ;(2)求41(B-A);90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .92、已知222244,5A x xy y B x xy y=-+=+-,求3A -B93、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B . 94、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.95、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0.96、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值: 2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .97、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值.98、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值99、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值.100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A 与B 的大小.答案:1、3(a+5b )-2(b-a )=5a+13b2、3a-(2b-a )+b=4a-b .3、2(2a 2+9b )+3(-5a 2-4b )=—11a2+6b24、(x 3-2y 3-3x 2y )-(3x 3-3y 3-7x 2y )= -2x 3+y 3+4x 2y5、3x 2-[7x-(4x-3)-2x 2] = 5x 2 -3x-36、(2xy-y )-(-y+yx )= xy7、5(a22b-3ab2)-2(a2b-7ab ) = -a2b+11ab8、(-2ab+3a )-2(2a-b )+2ab= -2a+b 9、(7m2n-5mn )-(4m2n-5mn )= 3m2n10、(5a 2+2a-1)-4(3-8a+2a 2)= -3a 2+34a-1311、-3x2y+3xy2+2x2y-2xy2= -x2y+xy 212、2(a-1)-(2a-3)+3.=413、-2(ab-3a 2)-[2b 2-(5ab+a2)+2ab]= 7a2+ab-2b 214、(x 2-xy+y )-3(x 2+xy-2y )= -2x 2-4xy+7y15、3x2-[7x-(4x-3)-2x2]=5x2-3x-316、a 2b-[2(a 2b-2a 2c )-(2bc+a 2c )]= -a 2b+2bc+6a 2c 17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3)= xy 2-x 2y 18、2(2x-3y )-(3x+2y+1)=2x-8y-1 19、-(3a 2-4ab )+[a 2-2(2a+2ab )]=-2a 2-4a20、5m-7n-8p+5n-9m-p = -4m-2n-9p 21、(5x 2y-7xy 2)-(xy 2-3x 2y )=4xy 2-4x 2y22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a]=-18a 2 +7a+223、3a 2-9a+5-(-7a 2+10a-5)=10a 2-19a+10 24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2)= -4a 2b-64ab 2 25、(5a-3a 2+1)-(4a 3-3a 2)=5a-4a 2+1 26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]=7a2+ab-2b227、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=028、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x-25 29、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a+(4b-3a )-(-3a+b )= 5a+3b31、(3a2-3ab+2b2)+(a2+2ab-2b2)= 4a2-ab32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].= -133、(2a 2-1+2a )-3(a-1+a 2)= -a 2-a+234、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)]=-2x 2+5xy-2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 = 31ab-136、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x-3y-138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a-4b+4 39、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y+4 41、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a 42、 3x -[5x +(3x -2)]=-5x+2 43、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x+y45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x+146、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2)=a 2+9a-1 47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).=3a 2b-ab 248、4a 2+2(3ab-2a 2)-(7ab-1)=1-ab49、21xy+(-41xy )-2xy 2-(-3y 2x )=41xy+xy250、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a51、5m-7n-8p+5n-9m+8p=-4m-2n52、(5x 2y-7xy 2)-(xy 2-3x 2y )=8x 2y-6xy 253、 3x 2y-[2x 2y-3(2xy-x 2y )-xy]=-2x 2y+7xy54、 3x 2-[5x-4(21x 2-1)]+5x 2 = 10x2-5x-455、2a 3b-21a 3b-a 2b+21a 2b-ab 2 =23a 3b- 21a 2b-ab 256、(a 2+4ab-4b 2)-3(a 2+b 2)-7(b 2-ab )=-2a 2+11ab-14b 2 57、a 2+2a 3+(-2a 3)+(-3a 3)+3a 2 = -3a 3+4a 258、5ab+(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2=8ab+8ab 2-a 2b59、(7y-3z )-(8y-5z )=-y+2z60、-3(2x 2-xy )+4(x 2+xy-6)=-2x 2+7xy-2461、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)=062、-3x 2y+2x 2y+3xy 2-2xy 2 = -x 2y+xy 263、3(a 2-2ab )-2(-3ab+b 2)=3a 2-2b 264、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}=8abc-6a 2b+ab 2 65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m 66、-[2m-3(m-n+1)-2]-1=m-3n+4 67、31a-( 21a-4b-6c)+3(-2c+2b)= -61a+10b 68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、x 2y-3xy 2+2yx 2-y 2x=3x 2y-4xy 2 70、41a 2b-0.4ab 2-21a 2b+52ab 2 = -41a 2b71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}= 10a+9b-2c-672、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]= 2x 2-y273、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34原式=2x 2+21y 2-2 =69874、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.原式=-3x+y 2=69475、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;原式=x 3+x 2-x+6=68376、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131 原式=5m-3n-1=577、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =原式=-2ab 3+3ab 2=1278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3. 原式=-2xyz=679、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2. 原式=-2x2+x-6=-16 80、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式. (2x 2+xy+3y 2 )——( x 2-xy )= x 2+2xy+3y 281、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.( 2a 2-4ab+b 2)—(-3a 2+2ab-5b 2)=5a 2-6ab+6b 282、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.(5x 2y -2x 2y )+(-2xy 2+4x 2y )=3xy 2+2x 2y 83、 求3x 2+x -5与4-x +7x 2的差.(3x 2+x -5)—(4-x +7x 2)=—4x 2+2x -9 84、计算 5y+3x+5z 2与12y+7x-3z2的和(5y+3x+5z 2)+(12y+7x-3z 2)=17y+10x+2z285、计算8xy2+3x 2y-2与-2x2y+5xy 2-3的差(8xy2+3x 2y-2)—(-2x 2y+5xy 2-3)=5x2y+3xy 2+186、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式MM=-21x 2+4xy —23y 87、当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.原式=-8xy+y= —15 88、化简再求值5abc-{2a 2b-[3abc-(4ab2-a2b )]-2ab2},其中a=-2,b=3,c=-41原式=83abc-a 2b-2ab2=3689、已知A=a2-2ab+b 2,B=a 2+2ab+b2(1)求A+B ; (2)求41(B-A);A+B=2a2+2b241(B-A)=ab90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得 9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?A=10x 2+x+5 A+B=11x 2+4x+391、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N . M-2N=5x 2-4x+3 92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B3A -B=11x 2-13xy+8y293、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B . 2A -3B= 5x 2+11xy +2y 2 94、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.原式=9ab 2-4a 2b=3495、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0. 原式=8abc-8a 2b=-3296、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值:2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .原式=-5x 2y+5xyz=9097、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值. 原式=10a+10b-2ab=5098、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值 原式=2m 2+6mn+5=1599、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a的值.B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A 与B 的大小.A=2a 2-4a +1 B =2a 2-4a +3 所以A<B。

整式的加减练习100题(有答案)

整式的加减练习100题(有答案)

整式的加减专项练习100题1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x2-xy+y)-3(x2+xy-2y)15、3x2-[7x-(4x-3)-2x2]16、a2b-[2(a2b-2a2c)-(2bc+a2c)];17、-2y3+(3xy2-x2y)-2(xy2-y3).18、2(2x-3y)-(3x+2y+1)19、-(3a2-4ab)+[a2-2(2a+2ab)].20、5m-7n-8p+5n-9m-p;21、(5x 2y-7xy 2)-(xy 2-3x 2y ); 22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a]. 23、3a 2-9a+5-(-7a 2+10a-5); 24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2). 25、(5a-3a 2+1)-(4a 3-3a 2);26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab] 27、(8xy -x 2+y 2)+(-y 2+x 2-8xy ); 28、(2x 2-21+3x )-4(x -x 2+21);29、3x 2-[7x -(4x -3)-2x 2].30、5a+(4b-3a )-(-3a+b );31、(3a2-3ab+2b2)+(a2+2ab-2b2); 32、2a2b+2ab2-[2(a2b-1)+2ab2+2]. 33、(2a 2-1+2a )-3(a-1+a 2); 34、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)].35、 -32ab +43a 2b +ab +(-43a 2b )-136、(8xy -x 2+y 2)+(-y 2+x 2-8xy ); 37、2x -(3x -2y +3)-(5y -2);38、-(3a +2b )+(4a -3b +1)-(2a -b -3)39、4x 3-(-6x 3)+(-9x 3) 40、3-2xy +2yx 2+6xy -4x 2y41、 1-3(2ab +a )十[1-2(2a -3ab )].42、 3x -[5x +(3x -2)];43、(3a 2b -ab 2)-(ab 2+3a 2b )44、()[]{}y x x y x --+--3233245、(-x 2+5+4x 3)+(-x 3+5x -4)46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2).47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).48、4a 2+2(3ab-2a 2)-(7ab-1).49、21xy+(-41xy )-2xy 2-(-3y 2x )50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m-7n-8p+5n-9m+8p52、(5x 2y-7xy 2)-(xy 2-3x 2y )53、 3x 2y-[2x 2y-3(2xy-x 2y )-xy]5556、(a 2+4ab-4b 2)-3(a 2+b 2)-7(b 2-ab ).57、a 2+2a 3+(-2a 3)+(-3a 3)+3a 258、5ab+(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2;59、(7y-3z )-(8y-5z );60、-3(2x 2-xy )+4(x 2+xy-6).61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)62、-3x 2y+2x 2y+3xy 2-2xy 2;63、3(a 2-2ab )-2(-3ab+b 2);64、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}.65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )].66、-[2m-3(m-n+1)-2]-1. 67、31a-( 21a-4b-6c)+3(-2c+2b)68、 -5a n-a n-(-7a n)+(-3a n)69、x 2y-3xy 2+2yx 2-y 2x70、41a 2b-0.4ab 2-21a 2b+52ab 2;71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}72、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy];73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-13177、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-79、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.80、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.81、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.82、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.83、 求3x 2+x -5与4-x +7x 2的差.84、计算 5y+3x+5z 2与12y+7x-3z 2的和85、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M87、当求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.88、化简再求值5abc-{2a2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ; (2)求41(B-A);90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B93、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .94、已知2 a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.95、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0.96、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值:2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .97、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值.98、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值99、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值.100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A 与B 的大小.答案:1、3(a+5b )-2(b-a )=5a+13b2、3a-(2b-a )+b=4a-b .3、2(2a 2+9b )+3(-5a 2-4b )=—11a 2+6b 24、(x 3-2y 3-3x 2y )-(3x 3-3y 3-7x 2y )= -2x 3+y 3+4x 2y5、3x 2-[7x-(4x-3)-2x 2] = 5x 2-3x-3 6、(2xy-y )-(-y+yx )= xy7、5(a 22b-3ab 2)-2(a 2b-7ab ) = -a 2b+11ab8、(-2ab+3a )-2(2a-b )+2ab= -2a+b 9、(7m 2n-5mn )-(4m 2n-5mn )= 3m 2n10、(5a 2+2a-1)-4(3-8a+2a 2)= -3a 2+34a-13 11、-3x 2y+3xy 2+2x 2y-2xy 2= -x 2y+xy 212、2(a-1)-(2a-3)+3.=413、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]= 7a 2+ab-2b 214、(x 2-xy+y )-3(x 2+xy-2y )= -2x 2-4xy+7y15、3x 2-[7x-(4x-3)-2x 2]=5x 2-3x-316、a 2b-[2(a 2b-2a 2c )-(2bc+a 2c )]= -a 2b+2bc+6a 2c 17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3)= xy 2-x 2y 18、2(2x-3y )-(3x+2y+1)=2x-8y-119、-(3a 2-4ab )+[a 2-2(2a+2ab )]=-2a 2-4a20、5m-7n-8p+5n-9m-p = -4m-2n-9p 21、(5x 2y-7xy 2)-(xy 2-3x 2y )=4xy 2-4x 2y 22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a]=-18a 2 +7a+2 23、3a 2-9a+5-(-7a 2+10a-5)=10a 2-19a+10 24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2)= -4a 2b-64ab 2 25、(5a-3a 2+1)-(4a 3-3a 2)=5a-4a 2+1 26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]=7a 2+ab-2b 227、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=0 28、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x-2529、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a+(4b-3a )-(-3a+b )= 5a+3b 31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2)= 4a 2-ab32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].= -133、(2a 2-1+2a )-3(a-1+a 2)= -a 2-a+234、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)]=-2x 2+5xy-2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 = 31ab-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x-3y-138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a-4b+4 39、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y+4 41、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42、 3x -[5x +(3x -2)]=-5x+243、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x+y 45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x+146、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2)=a 2+9a-147、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).=3a 2b-ab 248、4a 2+2(3ab-2a 2)-(7ab-1)=1-ab 49、21xy+(-41xy )-2xy 2-(-3y 2x )=41xy+xy 250、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a 51、5m-7n-8p+5n-9m+8p=-4m-2n59、(7y-3z )-(8y-5z )=-y+2z60、-3(2x2-xy )+4(x 2+xy-6)=-2x 2+7xy-24 61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)=062、-3x 2y+2x 2y+3xy 2-2xy 2 = -x 2y+xy 263、3(a 2-2ab )-2(-3ab+b 2)=3a 2-2b 264、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}=8abc-6a 2b+ab 2 65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m 66、-[2m-3(m-n+1)-2]-1=m-3n+4 67、31a-( 21a-4b-6c)+3(-2c+2b)= -61a+10b68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、71、71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}= 10a+9b-2c-672、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]= 2x 2-y 273、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =69874、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.原式=-3x+y 2=69475、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;原式=x 3+x 2-x+6=68376、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131原式=5m-3n-1=577、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =2原式=-2ab 3+3ab 2=12 78、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3. 原式=-2xyz=679、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.原式=-2x 2+x-6=-1680、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.(2x 2+xy+3y 2 ) ——( x 2-xy )= x 2+2xy+3y 2 81、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.( 2a 2-4ab+b 2 )—(-3a 2+2ab-5b 2)=5a 2 -6ab+6b 282、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.(5x 2y -2x 2y )+(-2xy 2+4x 2y )=3xy 2+2x 2y 83、 求3x 2+x -5与4-x +7x 2的差.(3x 2+x -5)—(4-x +7x 2)=—4x 2+2x -984、计算 5y+3x+5z 2与12y+7x-3z 2的和(5y+3x+5z 2)+(12y+7x-3z 2)=17y+10x+2z 2 85、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差(8xy 2+3x 2y-2)—(-2x 2y+5xy 2-3)=5x 2y+3xy 2+1 86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M M=-21x 2+4xy —23y87、当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.原式=-8xy+y= —15 88、化简再求值5abc-{2a2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41 原式=83abc-a 2b-2ab 2=36 89、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ; (2)求41(B-A); A+B=2a 2+2b 241(B-A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?A=10x 2+x+5 A+B=11x 2+4x+391、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N . M-2N=5x 2-4x+392、已知222244,5A x xy y B x xy y =-+=+-,求3A -B3A -B=11x 2-13xy+8y 293、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B . 2A -3B= 5x 2+11xy +2y 294、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.原式=9ab 2-4a 2b=3495、化简求值:5abc-2a2b+[3abc-2(4ab2-a2b)],其中a、b、c满足|a-1|+|b-2|+c2=0.原式=8abc-8a2b=-3296、已知a,b,z满足:(1)已知|x-2|+(y+3)2=0,(2)z是最大的负整数,化简求值:2(x2y+xyz)-3(x2y-xyz)-4x2y.原式=-5x2y+5xyz=9097、已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值.原式=10a+10b-2ab=5098、已知m2+3mn=5,求5m2-[+5m2-(2m2-mn)-7mn-5]的值原式=2m2+6mn+5=1599、设A=2x2-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若|x-2a|+(y-3)2=0,且B-2A=a,求a的值.B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A与B的大小.A=2a2-4a+1 B=2a2-4a+3 所以A<B。

整式的加减专项练习100题有答案(供参考)

整式的加减专项练习100题有答案(供参考)

整式的加减专项练习100题(有答案)1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x 2-xy+y )-3(x 2+xy-2y )15、3x 2-[7x-(4x-3)-2x 2]16、a 2b-[2(a 2b-2a 2c )-(2bc+a 2c )];17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3).18、2(2x-3y )-(3x+2y+1)19、-(3a 2-4ab )+[a 2-2(2a+2ab )].20、5m-7n-8p+5n-9m-p ;21、(5x 2y-7xy 2)-(xy 2-3x 2y );22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a].23、3a 2-9a+5-(-7a 2+10a-5);24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2).25、(5a-3a 2+1)-(4a 3-3a 2);26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]27、(8xy -x 2+y 2)+(-y 2+x 2-8xy );28、(2x 2-21+3x )-4(x -x 2+21);29、3x 2-[7x -(4x -3)-2x 2].30、5a+(4b-3a )-(-3a+b );31、(3a2-3ab+2b2)+(a2+2ab-2b2);32、2a2b+2ab2-[2(a2b-1)+2ab2+2].33、(2a 2-1+2a )-3(a-1+a 2);34、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)].35、 -32ab +43a 2b +ab +(-43a 2b )-136、(8xy -x 2+y 2)+(-y 2+x 2-8xy );37、2x -(3x -2y +3)-(5y -2);38、-(3a +2b )+(4a -3b +1)-(2a -b -3)39、4x 3-(-6x 3)+(-9x 3)40、3-2xy +2yx 2+6xy -4x 2y41、 1-3(2ab +a )十[1-2(2a -3ab )].42、 3x -[5x +(3x -2)];43、(3a 2b -ab 2)-(ab 2+3a 2b )44、()[]{}y x x y x --+--3233245、(-x 2+5+4x 3)+(-x 3+5x -4)46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2).47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).48、4a 2+2(3ab-2a 2)-(7ab-1).49、 21xy+(-41xy )-2xy 2-(-3y 2x )50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m-7n-8p+5n-9m+8p52、(5x 2y-7xy 2)-(xy 2-3x 2y )5556、(a 2+4ab-4b 2)-3(a 2+b 2)-7(b 2-ab ).57、a 2+2a 3+(-2a 3)+(-3a 3)+3a 2;58、5ab+(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2;59、(7y-3z )-(8y-5z );60、-3(2x 2-xy )+4(x 2+xy-6). 61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)62、-3x 2y+2x 2y+3xy 2-2xy 2;63、3(a 2-2ab )-2(-3ab+b 2);64、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}.65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )].66、-[2m-3(m-n+1)-2]-1.67、31a-( 21a-4b-6c)+3(-2c+2b) 68、 -5a n -a n -(-7a n )+(-3a n )69、x 2y-3xy 2+2yx 2-y 2x 70、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2;71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}72、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy];73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-13177、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3.79、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.80、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.81、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.82、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.83、 求3x 2+x -5与4-x +7x 2的差.84、计算 5y+3x+5z 2与12y+7x-3z 2的和85、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M87、当3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.88、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ;(2)求41(B-A);90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B93、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .94、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.95、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0.96、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值: 2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .97、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值.98、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值99、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值.100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A 与B的大小.答案:1、3(a+5b)-2(b-a)=5a+13b2、3a-(2b-a)+b=4a-b.3、2(2a2+9b)+3(-5a2-4b)=—11a2+6b24、(x3-2y3-3x2y)-(3x3-3y3-7x2y)= -2x3+y3+4x2y5、3x2-[7x-(4x-3)-2x2] = 5x2 -3x-36、(2xy-y)-(-y+yx)= xy7、5(a22b-3ab2)-2(a2b-7ab)= -a2b+11ab8、(-2ab+3a)-2(2a-b)+2ab= -2a+b9、(7m2n-5mn)-(4m2n-5mn)= 3m2n10、(5a2+2a-1)-4(3-8a+2a2)= -3a2+34a-1311、-3x2y+3xy2+2x2y-2xy2= -x2y+xy212、2(a-1)-(2a-3)+3.=413、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]= 7a2+ab-2b214、(x2-xy+y)-3(x2+xy-2y)= -2x2-4xy+7y15、3x2-[7x-(4x-3)-2x2]=5x2-3x-316、a2b-[2(a2b-2a2c)-(2bc+a2c)]= -a2b+2bc+6a2c17、-2y3+(3xy2-x2y)-2(xy2-y3)= xy2-x2y18、2(2x-3y)-(3x+2y+1)=2x-8y-119、-(3a2-4ab)+[a2-2(2a+2ab)]=-2a2-4a20、5m-7n-8p+5n-9m-p = -4m-2n-9p21、(5x2y-7xy2)-(xy2-3x2y)=4xy2-4x2y22、3(-3a2-2a)-[a2-2(5a-4a2+1)-3a]=-18a2 +7a+223、3a2-9a+5-(-7a2+10a-5)=10a2-19a+1024、-3a2b-(2ab2-a2b)-(2a2b+4ab2)= -4a2b-64ab225、(5a-3a 2+1)-(4a 3-3a 2)=5a-4a 2+126、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]=7a 2+ab-2b 2 27、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=028、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x-25 29、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a+(4b-3a )-(-3a+b )= 5a+3b31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2)= 4a 2-ab32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].= -133、(2a 2-1+2a )-3(a-1+a 2)= -a 2-a+234、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)]=-2x 2+5xy-2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 = 31ab-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x-3y-138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a-4b+439、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y+441、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42、 3x -[5x +(3x -2)]=-5x+243、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x+y45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x+146、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2)=a 2+9a-147、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).=3a 2b-ab 248、4a 2+2(3ab-2a 2)-(7ab-1)=1-ab49、 21xy+(-41xy )-2xy 2-(-3y 2x )=41xy+xy 250、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a51、5m-7n-8p+5n-9m+8p=-4m-2n57、a 2+2a 3+(-2a 3)+(-3a 3)+3a 2 = -3a 3+4a 2 58、5ab+(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2=8ab+8ab 2-a 2b59、(7y-3z )-(8y-5z )=-y+2z60、-3(2x 2-xy )+4(x 2+xy-6)=-2x 2+7xy-2461、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)=062、-3x 2y+2x 2y+3xy 2-2xy 2 = -x 2y+xy 263、3(a 2-2ab )-2(-3ab+b 2)=3a 2-2b 264、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}=8abc-6a 2b+ab 265、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m66、-[2m-3(m-n+1)-2]-1=m-3n+4 67、31a-( 21a-4b-6c)+3(-2c+2b)= -61a+10b 68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、x 2y-3xy 2+2yx 2-y 2x=3x 2y-4xy 271、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2 = -41a 2b71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}= 10a+9b-2c-672、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]= 2x 2-y 2 73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =698 74、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32. 原式=-3x+y 2=694 75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121; 原式=x 3+x 2-x+6=68376、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131 原式=5m-3n-1=577、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =2原式=-2ab 3+3ab 2=1278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3. 原式=-2xyz=679、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2. 原式=-2x 2+x-6=-1680、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.(2x 2+xy+3y 2 ) ——( x 2-xy )= x 2+2xy+3y 281、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.( 2a 2-4ab+b 2 )—(-3a 2+2ab-5b 2)=5a 2 -6ab+6b 282、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.(5x 2y -2x 2y )+(-2xy 2+4x 2y )=3xy 2+2x 2y83、 求3x 2+x -5与4-x +7x 2的差.(3x 2+x -5)—(4-x +7x 2)=—4x 2+2x -9 84、计算 5y+3x+5z 2与12y+7x-3z 2的和(5y+3x+5z 2)+(12y+7x-3z 2)=17y+10x+2z 285、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差(8xy 2+3x 2y-2)—(-2x 2y+5xy 2-3)=5x 2y+3xy 2+1 86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M—23y 87、当3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值. 原式=-8xy+y= —1588、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41 原式=83abc-a 2b-2ab 2=3689、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ;(2)求41(B-A); A+B=2a 2+2b 2 41(B-A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得 9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?A=10x 2+x+5 A+B=11x 2+4x+391、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .M-2N=5x 2-4x+3 92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B3A -B=11x 2-13xy+8y 293、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .2A -3B= 5x 2+11xy +2y 294、已知2 a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.原式=9ab 2-4a 2b=3495、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0. 原式=8abc-8a 2b=-32 96、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值: 2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .原式=-5x 2y+5xyz=9097、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值. 原式=10a+10b-2ab=5098、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值原式=2m 2+6mn+5=15 99、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值.B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A 与B 的大小.A=2a 2-4a +1 B =2a 2-4a +3 所以A<B。

整式的加减练习100题(有答案)

整式的加减练习100题(有答案)

整式的加减专项练习100题1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x2-xy+y)-3(x2+xy-2y)15、3x2-[7x-(4x-3)-2x2]16、a2b-[2(a2b-2a2c)-(2bc+a2c)];17、-2y3+(3xy2-x2y)-2(xy2-y3).18、2(2x-3y)-(3x+2y+1)19、-(3a2-4ab)+[a2-2(2a+2ab)].20、5m-7n-8p+5n-9m-p;21、(5x 2y-7xy 2)-(xy 2-3x 2y ); 22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a]. 23、3a 2-9a+5-(-7a 2+10a-5); 24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2). 25、(5a-3a 2+1)-(4a 3-3a 2);26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab] 27、(8xy -x 2+y 2)+(-y 2+x 2-8xy ); 28、(2x 2-21+3x )-4(x -x 2+21);29、3x 2-[7x -(4x -3)-2x 2].30、5a+(4b-3a )-(-3a+b );31、(3a2-3ab+2b2)+(a2+2ab-2b2); 32、2a2b+2ab2-[2(a2b-1)+2ab2+2]. 33、(2a 2-1+2a )-3(a-1+a 2); 34、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)].35、 -32ab +43a 2b +ab +(-43a 2b )-136、(8xy -x 2+y 2)+(-y 2+x 2-8xy ); 37、2x -(3x -2y +3)-(5y -2);38、-(3a +2b )+(4a -3b +1)-(2a -b -3)39、4x 3-(-6x 3)+(-9x 3) 40、3-2xy +2yx 2+6xy -4x 2y41、 1-3(2ab +a )十[1-2(2a -3ab )].42、 3x -[5x +(3x -2)];43、(3a 2b -ab 2)-(ab 2+3a 2b )44、()[]{}y x x y x --+--3233245、(-x 2+5+4x 3)+(-x 3+5x -4)46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2).47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).48、4a 2+2(3ab-2a 2)-(7ab-1).49、21xy+(-41xy )-2xy 2-(-3y 2x )50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m-7n-8p+5n-9m+8p52、(5x 2y-7xy 2)-(xy 2-3x 2y )53、 3x 2y-[2x 2y-3(2xy-x 2y )-xy]5556、(a 2+4ab-4b 2)-3(a 2+b 2)-7(b 2-ab ).57、a 2+2a 3+(-2a 3)+(-3a 3)+3a 258、5ab+(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2;59、(7y-3z )-(8y-5z );60、-3(2x 2-xy )+4(x 2+xy-6).61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)62、-3x 2y+2x 2y+3xy 2-2xy 2;63、3(a 2-2ab )-2(-3ab+b 2);64、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}.65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )].66、-[2m-3(m-n+1)-2]-1. 67、31a-( 21a-4b-6c)+3(-2c+2b)68、 -5a n-a n-(-7a n)+(-3a n)69、x 2y-3xy 2+2yx 2-y 2x70、41a 2b-0.4ab 2-21a 2b+52ab 2;71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}72、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy];73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-13177、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-79、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.80、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.81、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.82、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.83、 求3x 2+x -5与4-x +7x 2的差.84、计算 5y+3x+5z 2与12y+7x-3z 2的和85、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M87、当求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.88、化简再求值5abc-{2a2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ; (2)求41(B-A);90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B93、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .94、已知2 a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.95、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0.96、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值:2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .97、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值.98、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值99、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值.100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A 与B 的大小.答案:1、3(a+5b )-2(b-a )=5a+13b2、3a-(2b-a )+b=4a-b .3、2(2a 2+9b )+3(-5a 2-4b )=—11a 2+6b 24、(x 3-2y 3-3x 2y )-(3x 3-3y 3-7x 2y )= -2x 3+y 3+4x 2y5、3x 2-[7x-(4x-3)-2x 2] = 5x 2-3x-3 6、(2xy-y )-(-y+yx )= xy7、5(a 22b-3ab 2)-2(a 2b-7ab ) = -a 2b+11ab8、(-2ab+3a )-2(2a-b )+2ab= -2a+b 9、(7m 2n-5mn )-(4m 2n-5mn )= 3m 2n10、(5a 2+2a-1)-4(3-8a+2a 2)= -3a 2+34a-13 11、-3x 2y+3xy 2+2x 2y-2xy 2= -x 2y+xy 212、2(a-1)-(2a-3)+3.=413、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]= 7a 2+ab-2b 214、(x 2-xy+y )-3(x 2+xy-2y )= -2x 2-4xy+7y15、3x 2-[7x-(4x-3)-2x 2]=5x 2-3x-316、a 2b-[2(a 2b-2a 2c )-(2bc+a 2c )]= -a 2b+2bc+6a 2c 17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3)= xy 2-x 2y 18、2(2x-3y )-(3x+2y+1)=2x-8y-119、-(3a 2-4ab )+[a 2-2(2a+2ab )]=-2a 2-4a20、5m-7n-8p+5n-9m-p = -4m-2n-9p 21、(5x 2y-7xy 2)-(xy 2-3x 2y )=4xy 2-4x 2y 22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a]=-18a 2 +7a+2 23、3a 2-9a+5-(-7a 2+10a-5)=10a 2-19a+10 24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2)= -4a 2b-64ab 2 25、(5a-3a 2+1)-(4a 3-3a 2)=5a-4a 2+1 26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]=7a 2+ab-2b 227、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=0 28、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x-2529、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a+(4b-3a )-(-3a+b )= 5a+3b 31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2)= 4a 2-ab32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].= -133、(2a 2-1+2a )-3(a-1+a 2)= -a 2-a+234、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)]=-2x 2+5xy-2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 = 31ab-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x-3y-138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a-4b+4 39、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y+4 41、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42、 3x -[5x +(3x -2)]=-5x+243、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x+y 45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x+146、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2)=a 2+9a-147、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).=3a 2b-ab 248、4a 2+2(3ab-2a 2)-(7ab-1)=1-ab 49、21xy+(-41xy )-2xy 2-(-3y 2x )=41xy+xy 250、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a 51、5m-7n-8p+5n-9m+8p=-4m-2n59、(7y-3z )-(8y-5z )=-y+2z60、-3(2x2-xy )+4(x 2+xy-6)=-2x 2+7xy-24 61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)=062、-3x 2y+2x 2y+3xy 2-2xy 2 = -x 2y+xy 263、3(a 2-2ab )-2(-3ab+b 2)=3a 2-2b 264、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}=8abc-6a 2b+ab 2 65、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m 66、-[2m-3(m-n+1)-2]-1=m-3n+4 67、31a-( 21a-4b-6c)+3(-2c+2b)= -61a+10b68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、71、71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}= 10a+9b-2c-672、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]= 2x 2-y 273、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =69874、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.原式=-3x+y 2=69475、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;原式=x 3+x 2-x+6=68376、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131原式=5m-3n-1=577、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =2原式=-2ab 3+3ab 2=12 78、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3. 原式=-2xyz=679、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.原式=-2x 2+x-6=-1680、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.(2x 2+xy+3y 2 ) ——( x 2-xy )= x 2+2xy+3y 2 81、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.( 2a 2-4ab+b 2 )—(-3a 2+2ab-5b 2)=5a 2 -6ab+6b 282、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.(5x 2y -2x 2y )+(-2xy 2+4x 2y )=3xy 2+2x 2y 83、 求3x 2+x -5与4-x +7x 2的差.(3x 2+x -5)—(4-x +7x 2)=—4x 2+2x -984、计算 5y+3x+5z 2与12y+7x-3z 2的和(5y+3x+5z 2)+(12y+7x-3z 2)=17y+10x+2z 2 85、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差(8xy 2+3x 2y-2)—(-2x 2y+5xy 2-3)=5x 2y+3xy 2+1 86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M M=-21x 2+4xy —23y87、当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.原式=-8xy+y= —15 88、化简再求值5abc-{2a2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41 原式=83abc-a 2b-2ab 2=36 89、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ; (2)求41(B-A); A+B=2a 2+2b 241(B-A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?A=10x 2+x+5 A+B=11x 2+4x+391、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N . M-2N=5x 2-4x+392、已知222244,5A x xy y B x xy y =-+=+-,求3A -B3A -B=11x 2-13xy+8y 293、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B . 2A -3B= 5x 2+11xy +2y 294、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.原式=9ab 2-4a 2b=3495、化简求值:5abc-2a2b+[3abc-2(4ab2-a2b)],其中a、b、c满足|a-1|+|b-2|+c2=0.原式=8abc-8a2b=-3296、已知a,b,z满足:(1)已知|x-2|+(y+3)2=0,(2)z是最大的负整数,化简求值:2(x2y+xyz)-3(x2y-xyz)-4x2y.原式=-5x2y+5xyz=9097、已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值.原式=10a+10b-2ab=5098、已知m2+3mn=5,求5m2-[+5m2-(2m2-mn)-7mn-5]的值原式=2m2+6mn+5=1599、设A=2x2-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若|x-2a|+(y-3)2=0,且B-2A=a,求a的值.B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A=2a2-4a+1,B=2(a2-2a)+3,当a取任意有理数时,请比较A与B的大小.A=2a2-4a+1 B=2a2-4a+3 所以A<B。

整式的加减练习100题(有答案)

整式的加减练习100题(有答案)

整式的加减专项练习100题1.3a-(2b-a)+b2.2(2a2+9b)+3(-5a2-4b)4.(x3-2y3-3x2y)-(3x3-3y3-7x2y)5. 3x2-[7x-(4x-3)-2x2]6.(2xy-y)-(-y+yx)9.(7m2n-5mn)-(4m2n-5mn)11. -3x2y+3xy2+2x2y-2xy212. 2(a-1)-(2a-3)+313. -2(ab-3a2)-[2b2-(5ab+a2)+2ab]15.3x2-[7x-(4x-3)-2x2]16.a2b-[2(a2b-2a2c)-(2bc+a2c)]17. 2(2x-3y)-(3x+2y+1)20. 5m-7n-8p+5n-9m-p21.(5x2y-7xy2)-(xy2-3x2y)23.3a2-9a+5-(-7a2+10a-5)24.-3a2b-(2ab2-a2b)-(2a2b+4ab2)25.(5a-3a2+1)-(4a3-3a2)25.-2(ab-3a2)-[2b2-(5ab+a2)+2ab] 26.(8xy-x2+y2)+(-y2+x2-8xy)29. 3x2-[7x-(4x-3)-2x2]30.5a+(4b-3a)-(-3a+b)35、-32ab+43a2b+ab+(-43a2b)-136.(8xy-x2+y2)+(-y2+x2-8xy)37.37.2x-(3x-2y+3)-(5y-2)38.-(3a+2b)+(4a-3b+1)-(2a-b-3)39. 4x3-(-6x3)+(-9x3)40.3-2xy+2yx2+6xy-4x2y41.3x-[5x+(3x-2)]43.(3a2b-ab2)-(ab2+3a2b)45.(-x2+5+4x3)+(-x3+5x-4) 46.(5a2-2a+3)-(1-2a+a2)+3(-1+3a-a2)48. 4a2+2(3ab-2a2)-(7ab-1)49.21xy+(-41xy)-2xy2-(-3y2x)51. 5m-7n-8p+5n-9m+8p52.(5x2y-7xy2)-(xy2-3x2y55. 2a3b-21a3b-a2b+21a2b-ab257、a2+2a3+(-2a3)+(-3a3)+3a258. 5ab+(-4a2b2)+8ab2-(-3ab)+(-a2b)+4a2b259.(7y-3z)-(8y-5z)60.-3(2x2-xy)+4(x2+xy-6)61.(x3+3x2y-5xy2+9y3)+(-2y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)62、-3x2y+2x2y+3xy2-2xy264.5abc-{2a2b-[3abc-(4a2b-ab2]}67.31a-(21a-4b-6c)+3(-2c+2b)68、-5a n-a n-(-7a n)+(-3a n)69.x2y-3xy2+2yx2-y2x70、41a2b-0.4ab2-21a2b+52ab271.3a-{2c-[6a-(c-b)+c+(a+8b-6)]}72.-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]75.x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---76、 化简(4m+n )-[1-(m-4n )]77.化简.求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b=80、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.81.若2a2-4ab+b2与一个多项式的差是-3a2+2ab-5b2,试求这个多项式.82.求5x2y-2x2y与-2xy2+4x2y的和.83. 求3x2+x-5与4-x+7x2的差.84.计算 5y+3x+5z2与12y+7x-3z2的和85.计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差86. 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M87、当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.88、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189.已知A=a2-2ab+b2,B=a2+2ab+b2(1)求A+B;1(B-A);(2)求490.小明同学做一道题,已知两个多项式A,B,计算A+B,他误将A+B看作A-B,求得9x2-2x+7,若B=x2+3x-2,你能否帮助小明同学求得正确答案?92.已知2222=-+=+-,求3A-B44,5A x xy yB x xy y94.已知2a+(b+1)2=0,求5ab2-[2a2b-(4ab2-2a2b)]的值.97.已知a+b=7,ab=10,求代数式(5ab+4a+7b)+(6a-3ab)-(4ab-3b)的值.答案:1.3(a+5b )-2(b-a )=5a+13b2.3a-(2b-a )+b=4a-b .3.2(2a 2+9b )+3(-5a 2-4b )=—11a 2+6b 24.(x 3-2y 3-3x 2y )-(3x 3-3y 3-7x 2y )= -2x 3+y 3+4x 2y5.3x 2-[7x-(4x-3)-2x 2] = 5x 2-3x-3 6.(2xy-y )-(-y+yx )= xy 7.5(a22b-3ab 2)-2(a 2b-7ab ) = -a 2b+11ab8.(-2ab+3a )-2(2a-b )+2ab= -2a+b 9.(7m 2n-5mn )-(4m 2n-5mn )= 3m 2n10.(5a 2+2a-1)-4(3-8a+2a 2)= -3a 2+34a-13 11.-3x 2y+3xy 2+2x 2y-2xy 2= -x 2y+xy 212.2(a-1)-(2a-3)+3.=413.-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]= 7a 2+ab-2b 214.(x 2-xy+y )-3(x 2+xy-2y )= -2x 2-4xy+7y 15.3x 2-[7x-(4x-3)-2x 2]=5x 2-3x-316.a 2b-[2(a 2b-2a 2c )-(2bc+a 2c )]= -a 2b+2bc+6a 2c17.-2y 3+(3xy 2-x 2y )-2(xy 2-y 3)= xy 2-x 2y 18.2(2x-3y )-(3x+2y+1)=2x-8y-1 19.-(3a 2-4ab )+[a 2-2(2a+2ab )]=-2a 2-4a 20.5m-7n-8p+5n-9m-p = -4m-2n-9p21.(5x 2y-7xy 2)-(xy 2-3x 2y )=4xy 2-4x 2y22.3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a]=-18a 2+7a+223.3a 2-9a+5-(-7a 2+10a-5)=10a 2-19a+1024.-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2)= -4a 2b-64ab 225、(5a-3a 2+1)-(4a 3-3a 2)=5a-4a 2+126.-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]=7a 2+ab-2b 227.(8xy -x 2+y 2)+(-y 2+x 2-8xy )=0 28.(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x-25 29.3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330.5a+(4b-3a )-(-3a+b )= 5a+3b31.(3a 2-3ab+2b 2)+(a 2+2ab-2b 2)= 4a 2-ab 32.2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].= -133.(2a 2-1+2a )-3(a-1+a 2)= -a 2-a+234.2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)]=-2x 2+5xy-2y 235.-2ab +3a 2b +ab +(-3a 2b )-1 = 1ab-137.2x -(3x -2y +3)-(5y -2)=-x-3y-138.-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a-4b+439.4x 3-(-6x 3)+(-9x 3)= x 340.3-2xy +2yx 2+6xy -4x 2y = -2 x 2y+441. 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42. 3x -[5x +(3x -2)]=-5x+243.(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244.()[]{}y x x y x --+--32332 = 5x+y45.(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x+146.(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2)=a 2+9a-147.5(3a 2b-ab 2)-4(-ab 2+3a 2b ).=3a 2b-ab 248.4a 2+2(3ab-2a 2)-(7ab-1)=1-ab 49. 21xy+(-41xy )-2xy 2-(-3y 2x )=41xy+xy 250.5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a51.5m-7n-8p+5n-9m+8p=-4m-2n 52.(5x 2y-7xy 2)-(xy 2-3x 2y )=8x 2y-6xy 253. 3x 2y-[2x 2y-3(2xy-x 2y )-xy]=-2x 2y+7xy54. 3x 2-[5x-4( 21x 2-1)]+5x 2 = 10x 2-5x-4 55.2a 3b- 21a 3b-a 2b+ 21a 2b-ab 2 = 23a 3b- 21a 2b-ab 2 56.(a 2+4ab-4b 2)-3(a 2+b 2)-7(b 2-ab )=-2a 2+11ab-14b 257.a 2+2a 3+(-2a 3)+(-3a 3)+3a 2 = -3a 3+4a 2 58.5ab+(-4a 2b 2)+8ab 2-(-3ab )+(-a 2b )+4a 2b 2=8ab+8ab 2-a 2b59.(7y-3z )-(8y-5z )=-y+2z 60.-3(2x 2-xy )+4(x 2+xy-6)=-2x 2+7xy-2461.(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)=062.-3x 2y+2x 2y+3xy 2-2xy 2 = -x 2y+xy 2 63.3(a 2-2ab )-2(-3ab+b 2)=3a 2-2b 264.5abc-{2a 2b-[3abc-(4a 2b-ab 2]}=8abc-6a 2b+ab 265.5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m66.-[2m-3(m-n+1)-2]-1=m-3n+467.31a-( 21a-4b-6c)+3(-2c+2b)= -61a+10b 68. -5a n -a n -(-7a n )+(-3a n )= -2a n69.x 2y-3xy 2+2yx 2-y 2x=3x 2y-4xy 271、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2 = -41a 2b 71.3a-{2c-[6a-(c-b )+c+(a+8b-6)]}= 10a+9b-2c-672.-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]= 2x 2-y 273.化简.求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =69874.化简.求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32. 原式=-3x+y 2=694 75.x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121; 原式=x 3+x 2-x+6=68376. 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131 原式=5m-3n-1=577.化简.求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =原式=-2ab 3+3ab 2=1278.化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3.原式=-2xyz=679.化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.原式=-2x 2+x-6=-1680.若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.(2x 2+xy+3y 2 ) ——( x 2-xy )= x 2+2xy+3y 2 81.若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.( 2a 2-4ab+b 2 )—(-3a 2+2ab-5b 2)=5a 2 -6ab+6b 282.求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.(5x 2y -2x 2y )+(-2xy 2+4x 2y )=3xy 2+2x 2y83. 求3x 2+x -5与4-x +7x 2的差.(3x 2+x -5)—(4-x +7x 2)=—4x 2+2x -984.计算 5y+3x+5z 2与12y+7x-3z 2的和(5y+3x+5z 2)+(12y+7x-3z 2)=17y+10x+2z 285.计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差(8xy 2+3x 2y-2)—(-2x 2y+5xy 2-3)=5x 2y+3xy 2+1 86. 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M M=-21x 2+4xy —23y 87.当x=- 21,y=-3时,求代数式3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值. 原式=-8xy+y= —1588.化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41 原式=83abc-a 2b-2ab 2=3689.已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ;(2)求41(B-A); A+B=2a 2+2b 2 41(B-A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?A=10x 2+x+5 A+B=11x 2+4x+391.已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .M-2N=5x 2-4x+392、已知222244,5A x xy y B x xy y =-+=+-,求3A -B3A -B=11x 2-13xy+8y 293.已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .2A -3B= 5x 2+11xy +2y 294.已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值. 原式=9ab 2-4a 2b=3495.化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a.b.c 满足|a-1|+|b-2|+c 2=0.原式=8abc-8a 2b=-3296.已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值: 2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .原式=-5x 2y+5xyz=9097.已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值. 原式=10a+10b-2ab=5098.已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值原式=2m 2+6mn+5=1599、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值.B-2A=-7x-5y=-14a-15=a a=-1100.有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A 与B 的大小.A=2a 2-4a +1 B =2a 2-4a +3 所以A<B。

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整式的加减专项练习1、3(a+5b)-2(b-a)2、3a-(2b-a)+b3、2(2a2+9b)+3(-5a2-4b)4、(x3-2y3-3x2y)-(3x3-3y3-7x2y)5、3x2-[7x-(4x-3)-2x2]6、(2xy-y)-(-y+yx)7、5(a2b-3ab2)-2(a2b-7ab)8、(-2ab+3a)-2(2a-b)+2ab 9、(7m2n-5mn)-(4m2n-5mn)10、(5a2+2a-1)-4(3-8a+2a2).11、-3x2y+3xy2+2x2y-2xy2;12、2(a-1)-(2a-3)+3.13、-2(ab-3a2)-[2b2-(5ab+a2)+2ab]14、(x2-xy+y)-3(x2+xy-2y)15、3x2-[7x-(4x-3)-2x2]16、a2b-[2(a2b-2a2c)-(2bc+a2c)];17、-2y3+(3xy2-x2y)-2(xy2-y3).18、2(2x-3y)-(3x+2y+1)19、-(3a2-4ab)+[a2-2(2a+2ab)].20、5m-7n-8p+5n-9m-p ;21、(5x 2y-7xy 2)-(xy 2-3x 2y ); 22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a].23、3a 2-9a+5-(-7a 2+10a-5); 24、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2).25、(5a-3a 2+1)-(4a 3-3a 2); 26、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]27、(8xy -x 2+y 2)+(-y 2+x 2-8xy ); 28、(2x 2-21+3x )-4(x -x 2+21);29、3x 2-[7x -(4x -3)-2x 2]. 30、5a+(4b-3a )-(-3a+b );31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2); 32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].33、(2a 2-1+2a )-3(a-1+a 2); 34、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)].35、 -32ab +43a 2b +ab +(-43a 2b )-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy );37、2x -(3x -2y +3)-(5y -2); 38、-(3a +2b )+(4a -3b +1)-(2a -b -3)39、4x 3-(-6x 3)+(-9x 3) 40、3-2xy +2yx 2+6xy -4x 2y41、 1-3(2ab +a )十[1-2(2a -3ab )].42、 3x -[5x +(3x -2)];43、(3a 2b -ab 2)-(ab 2+3a 2b ) 44、()[]{}y x x y x --+--3233245、(-x 2+5+4x 3)+(-x 3+5x -4) 46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2).47、5(3a 2b-ab 2)-4(-ab 2+3a 2b ). 48、4a 2+2(3ab-2a 2)-(7ab-1).49、 21xy+(-41xy )-2xy 2-(-3y 2x ) 50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]51、5m-7n-8p+5n-9m+8p 52、(5x 2y-7xy 2)-(xy 2-3x 2y )53、 3x2y-[2x2y-3(2xy-x2y)-xy] 54、5556、(a2+4ab-4b2)-3(a2+b2)-7(b2-ab).57、a2+2a3+(-2a3)+(-3a3)+3a2;58、5ab+(-4a2b2)+8ab2-(-3ab)+(-a2b)+4a2b2; 59、(7y-3z)-(8y-5z);60、-3(2x2-xy)+4(x2+xy-6).61、(x3+3x2y-5xy2+9y3)+(-2y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)62、-3x2y+2x2y+3xy2-2xy2; 63、3(a2-2ab)-2(-3ab+b2);64、5abc-{2a2b-[3abc-(4a2b-ab2]}.65、5m2-[m2+(5m2-2m)-2(m2-3m)].66、-[2m-3(m-n+1)-2]-1.67、31a-( 21a-4b-6c)+3(-2c+2b) 68、 -5a n -a n -(-7a n )+(-3a n ) 69、x 2y-3xy 2+2yx 2-y 2x70、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2;71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}72、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy];73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-3474、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32.75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121;76、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-13177、化简、求值2(a2b+2b3-ab3)+3a3-(2ba2-3ab2+3a3)-4b3,其中a=-3,b=278、化简,求值:(2x3-xyz)-2(x3-y3+xyz)+(xyz-2y3),其中x=1,y=2,z=-3.79、化简,求值:5x2-[3x-2(2x-3)+7x2],其中x=-2.80、若两个多项式的和是2x2+xy+3y2,一个加式是x2-xy,求另一个加式.81、若2a2-4ab+b2与一个多项式的差是-3a2+2ab-5b2,试求这个多项式.82、求5x2y-2x2y与-2xy2+4x2y的和.83、求3x2+x-5与4-x+7x2的差.84、计算 5y+3x+5z2与12y+7x-3z2的和85、计算8xy2+3x2y-2与-2x2y+5xy2-3的差86、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M87、当3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值.88、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-4189、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2(1)求A+B ; (2)求41(B-A);90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?91、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .92、已知222244,5A x xy y B x xy y =-+=+-,求3A -B93、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .94、已知2 a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值.95、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0.96、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值:2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .97、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值.98、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值99、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值.100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A 与B 的大小.整式的加减专项练习答案:1、3(a+5b )-2(b-a )=5a+13b2、3a-(2b-a )+b=4a-b .3、2(2a 2+9b )+3(-5a 2-4b )=—11a 2+6b 2 4、(x 3-2y 3-3x 2y )-(3x 3-3y 3-7x 2y )= -2x 3+y 3+4x 2y5、3x 2-[7x-(4x-3)-2x 2] = 5x 2 -3x-36、(2xy-y )-(-y+yx )= xy7、5(a 22b-3ab 2)-2(a 2b-7ab ) = -a 2b+11ab 8、(-2ab+3a )-2(2a-b )+2ab= -2a+b9、(7m 2n-5mn )-(4m 2n-5mn )= 3m 2n10、(5a 2+2a-1)-4(3-8a+2a 2)= -3a 2+34a-1311、-3x 2y+3xy 2+2x 2y-2xy 2= -x 2y+xy 212、2(a-1)-(2a-3)+3.=413、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]= 7a 2+ab-2b 214、(x 2-xy+y )-3(x 2+xy-2y )= -2x 2-4xy+7y15、3x 2-[7x-(4x-3)-2x 2]=5x 2-3x-3 16、a 2b-[2(a 2b-2a 2c )-(2bc+a 2c )]= -a 2b+2bc+6a 2c17、-2y 3+(3xy 2-x 2y )-2(xy 2-y 3)= xy 2-x 2y18、2(2x-3y )-(3x+2y+1)=2x-8y-1 19、-(3a 2-4ab )+[a 2-2(2a+2ab )]=-2a 2-4a20、5m-7n-8p+5n-9m-p = -4m-2n-9p21、(5x 2y-7xy 2)-(xy 2-3x 2y )=4xy 2-4x 2y22、3(-3a 2-2a )-[a 2-2(5a-4a 2+1)-3a]=-18a 2 +7a+223、3a 2-9a+5-(-7a 2+10a-5)=10a 2-19a+1024、-3a 2b-(2ab 2-a 2b )-(2a 2b+4ab 2)= -4a 2b-64ab 225、(5a-3a 2+1)-(4a 3-3a 2)=5a-4a 2+126、-2(ab-3a 2)-[2b 2-(5ab+a 2)+2ab]=7a 2+ab-2b 2 27、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=028、(2x 2-21+3x )-4(x -x 2+21) = 6x 2-x-25 29、3x 2-[7x -(4x -3)-2x 2]= 5x 2-3x -330、5a+(4b-3a )-(-3a+b )= 5a+3b31、(3a 2-3ab+2b 2)+(a 2+2ab-2b 2)= 4a 2-ab32、2a 2b+2ab 2-[2(a 2b-1)+2ab 2+2].= -133、(2a 2-1+2a )-3(a-1+a 2)= -a 2-a+234、2(x 2-xy )-3(2x 2-3xy )-2[x 2-(2x 2-xy+y 2)]=-2x 2+5xy-2y 235、-32ab +43a 2b +ab +(-43a 2b )-1 = 31ab-1 36、(8xy -x 2+y 2)+(-y 2+x 2-8xy )=037、2x -(3x -2y +3)-(5y -2)=-x-3y-138、-(3a +2b )+(4a -3b +1)-(2a -b -3)= -a-4b+439、4x 3-(-6x 3)+(-9x 3)= x 340、3-2xy +2yx 2+6xy -4x 2y = -2 x 2y+441、 1-3(2ab +a )十[1-2(2a -3ab )]=2-7a42、 3x -[5x +(3x -2)]=-5x+243、(3a 2b -ab 2)-(ab 2+3a 2b )= -2ab 244、()[]{}y x x y x --+--32332 = 5x+y45、(-x 2+5+4x 3)+(-x 3+5x -4)= 3x 3-x 2+5x+1 46、(5a 2-2a+3)-(1-2a+a 2)+3(-1+3a-a 2)=a 2+9a-147、5(3a 2b-ab 2)-4(-ab 2+3a 2b ).=3a 2b-ab 248、4a 2+2(3ab-2a 2)-(7ab-1)=1-ab49、 21xy+(-41xy )-2xy 2-(-3y 2x )=41xy+xy 2 50、5a 2-[a 2-(5a 2-2a )-2(a 2-3a )]=11a 2-8a51、5m-7n-8p+5n-9m+8p=-4m-2n59、(7y-3z )-(8y-5z )=-y+2z60、-3(2x 2-xy )+4(x 2+xy-6)=-2x 2+7xy-24 61、(x 3+3x 2y-5xy 2+9y 3)+(-2y 3+2xy 2+x 2y-2x 3)-(4x 2y-x 3-3xy 2+7y 3)=0 62、-3x 2y+2x 2y+3xy 2-2xy 2 = -x 2y+xy 263、3(a 2-2ab )-2(-3ab+b 2)=3a 2-2b 264、5abc-{2a 2b-[3abc-(4a 2b-ab 2]}=8abc-6a 2b+ab 265、5m 2-[m 2+(5m 2-2m )-2(m 2-3m )]=m 2-4m66、-[2m-3(m-n+1)-2]-1=m-3n+467、31a-( 21a-4b-6c)+3(-2c+2b)= -61a+10b 68、 -5a n -a n -(-7a n )+(-3a n )= -2a n69、x 2y-3xy 2+2yx 2-y 2x=3x 2y-4xy 271、 41a 2b-0.4ab 2- 21a 2b+ 52ab 2 = -41a 2b 71、3a-{2c-[6a-(c-b )+c+(a+8b-6)]}= 10a+9b-2c-672、-3(xy-2x 2)-[y 2-(5xy-4x 2)+2xy]= 2x 2-y 2 73、化简、求值21x 2-2212- (x + y )2⎡⎤⎢⎥⎣⎦-23(-32x 2+31y 2),其中x =-2, y =-34 原式=2x 2+21y 2-2 =698 74、化简、求值21x -2(x -31y 2)+(-23x +31y 2),其中x =-2,y =-32. 原式=-3x+y 2=694 75、x x x x x x 5)64(213223312323-++-⎪⎭⎫ ⎝⎛---其中x =-121; 原式=x 3+x 2-x+6=68376、 化简,求值(4m+n )-[1-(m-4n )],m=52 n=-131 原式=5m-3n-1=577、化简、求值2(a 2b +2b 3-ab 3)+3a 3-(2ba 2-3ab 2+3a 3)-4b 3,其中a =-3,b =2原式=-2ab 3+3ab 2=1278、化简,求值:(2x 3-xyz )-2(x 3-y 3+xyz )+(xyz-2y 3),其中x=1,y=2,z=-3.原式=-2xyz=679、化简,求值:5x 2-[3x-2(2x-3)+7x 2],其中x=-2.原式=-2x 2+x-6=-1680、若两个多项式的和是2x 2+xy+3y 2,一个加式是x 2-xy ,求另一个加式.(2x 2+xy+3y 2 ) ——( x 2-xy )= x 2+2xy+3y 281、若2a 2-4ab+b 2与一个多项式的差是-3a 2+2ab-5b 2,试求这个多项式.( 2a 2-4ab+b 2 )—(-3a 2+2ab-5b 2)=5a 2 -6ab+6b 282、求5x 2y -2x 2y 与-2xy 2+4x 2y 的和.(5x 2y -2x 2y )+(-2xy 2+4x 2y )=3xy 2+2x 2y83、 求3x 2+x -5与4-x +7x 2的差.(3x 2+x -5)—(4-x +7x 2)=—4x 2+2x -984、计算 5y+3x+5z 2与12y+7x-3z 2的和(5y+3x+5z 2)+(12y+7x-3z 2)=17y+10x+2z 285、计算8xy 2+3x 2y-2与-2x 2y+5xy 2-3的差(8xy 2+3x 2y-2)—(-2x 2y+5xy 2-3)=5x 2y+3xy 2+186、 多项式-x 2+3xy-21y 与多项式M 的差是-21x 2-xy+y ,求多项式M23y 87、当3(x 2-2xy )-[3x 2-2y+2(xy+y )]的值. 原式=-8xy+y= —1588、化简再求值5abc-{2a 2b-[3abc-(4ab 2-a 2b )]-2ab 2},其中a=-2,b=3,c=-41 原式=83abc-a 2b-2ab 2=3689、已知A=a 2-2ab+b 2,B=a 2+2ab+b 2 (1)求A+B ;(2)求41(B-A); A+B=2a 2+2b 2 41(B-A)=ab 90、小明同学做一道题,已知两个多项式A ,B ,计算A+B ,他误将A+B 看作A-B ,求得 9x 2-2x+7,若B=x 2+3x-2,你能否帮助小明同学求得正确答案?A=10x 2+x+5 A+B=11x 2+4x+391、已知:M=3x 2+2x-1,N=-x 2-2+3x ,求M-2N .M-2N=5x 2-4x+392、已知222244,5A x xy y B x xy y =-+=+-,求3A -B3A -B=11x 2-13xy+8y 293、已知A =x 2+xy +y 2,B =-3xy -x 2,求2A -3B .2A -3B= 5x 2+11xy +2y 294、已知2-a +(b +1)2=0,求5ab 2-[2a 2b -(4ab 2-2a 2b )]的值. 原式=9ab 2-4a 2b=3495、化简求值:5abc-2a 2b+[3abc-2(4ab 2-a 2b )],其中a 、b 、c 满足|a-1|+|b-2|+c 2=0. 原式=8abc-8a 2b=-3296、已知a ,b ,z 满足:(1)已知|x-2|+(y+3)2=0,(2)z 是最大的负整数,化简求值: 2(x 2y+xyz )-3(x 2y-xyz )-4x 2y .原式=-5x 2y+5xyz=9097、已知a+b=7,ab=10,求代数式(5ab+4a+7b )+(6a-3ab )-(4ab-3b )的值. 原式=10a+10b-2ab=5098、已知m 2+3mn=5,求5m 2-[+5m 2-(2m 2-mn )-7mn-5]的值原式=2m 2+6mn+5=1599、设A=2x 2-3xy+y 2+2x+2y ,B=4x 2-6xy+2y 2-3x-y ,若|x-2a|+(y-3)2=0,且B-2A=a ,求a 的值. B-2A=-7x-5y=-14a-15=a a=-1100、有两个多项式:A =2a 2-4a +1,B =2(a 2-2a )+3,当a 取任意有理数时,请比较A与B 的大小. A=2a 2-4a +1 B =2a 2-4a +3 所以A<B。

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