合并同类项计算题
- 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。
合并同类项计算题
1.a-(a-3b+4c)+3(-c+2b)
2 .(3x2-2xy+7)-(-4x2+5xy+6)
3.3ab-4ab+8ab-7ab+ab= _____ .
4.7x-(5x-5y)-y= ______ .
5.23a3bc2-15ab2c+8abc-24a3bc2-8abc= _____ .
6.-7x2+6x+13x2-4x-5x2= ____ .
7. 2y+(-2y+5)-(3y+2) = _____ .
11.(2x2-3xy+4y2)+(x2+2xy-3y2)= ____ .
12. 2a-(3a-2b+2)+(3a-4b-1)= _____ .
13. -6x2-7x2+15x2-2x2 = _______ .
14. 2x-(x+3y)-(-x-y)-(x-y) = ______ .
16.2x+2y-[3x-2(x-y)]= ______
17.5-(1-x)-1-(x-1)= _____
18.( )+(4xy+7x2-y2)=10x2-xy .
1 9.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3 .
21. ____________________________________________ 已知A=x3-2x2+x-4 , B=2x3-5x+3,计算A+B= __________________________ .
22. ____________________________________________ 已知A=x3-2x2+x-4 , B=2x3-5x+3,计算A-B= __________________________ .
23. 若a=-0.2 , b=0.5,代数式-(|a2b|-|ab2|) 的值为_______ .
25.一个多项式减去3m4-m3-2m+5寻-2m4-3m3-2m2-1,那么这个多项式等于
26.-(2x2-y2)-[2y2-(x2+2xy)]= _____
27. _________________________________________ 若-3a3b2 与5ax-1by+2 是
同类项,贝U x= ______________________________ ,y=_____ .
28. (-y+6+3y4-y3)-(2y2-3y3+y4-7) = _____ .
29.化简代数式4x2-[7x2-5x-3(1-2x+x2)] 的结果是 __________
30.2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ) .
31.3a-(2a-3b)+3(a-2b)-b= _____
32.化简代数式x-[y-2x-(x+y)] 等于__________
33.[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1 .
34.3x-[y-(2x+y)]= _____
35. 化简|1-x+y|-|x-y|( _________ 其中x v 0, y> 0)等于.
36. 已知x< y, x+y-|x-y|= ______ .
37.已知x v 0,y v 0,化简|x+y|-|5-x-y|= _____ .
38. 4a2n-an-(3an-2a2n) = _______ .
39.若一个多项式加上-3x2y+2x2-3xy-4 得
2x2y+3xy2-x2+2xy ,
则这个多项式为________ .
40.-5xm-xm-(-7xm)+(-3xm)= ____ .
41 .当a=-1 , b=-2 时,
[a-(b-c)]-[-b-(-c-a)] —____ .
43.当a=-1 , b=1, c=-1 时,
-[b-2(-5a)]-(-3b+5c) — _____ .
44.-2(3x+z)-(-6x)+(-5y+3z)= _____ .
45.-5an-an+1-(-7an+1)+(-3an) — _____ .
46.3a-(2a-4b-6c)+3(-2c+2b)=______ .
48.9a2+[7a2-2a-(-a2+3a)]= _____ .
50.当2y-x=5 时, 5(x-2y)2-3(-x+2y)-100= _____ .
( 三) 化简
70.(4x2-8x+5)-(x3+3x2-6x+2) .
72.(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2) .
73. -{2a2b-[3abc-(4ab2-a2b)] 74.(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b) .
75. (x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2) .
76. (3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4) .
77. (4a-2b-c)-5a-[8b-2c-(a+b)] .
78. (2m-3n)-(3m-2n)+(5n+m) .
79. (3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab) .
80. xy-(2xy-3z)+(3xy-4z) .
81. (-3x3+2x2-5x+1)-(5-6x-x2+x3) .
83. 3x-(2x-4y-6x)+3(-2z+2y) .
84. (-x2+4+3x4-x3)-(x2+2x-x4-5) .
85 .若A=5a2-2ab+3b2 B=-2b2+3ab-a2,计算A+B
86. 已知A=3a2-5a-12, B=2a2+3a-4,求2(A-B).
87. 2m-{-3n+[-4m-(3m-n)] }.
88. 5m2n+(-2m2n)+2mn2-(+m2n).
89. 4(x-y+z)-2(x+y-z)-3(-x-y-z) .
90. 2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2) .
92. 2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2) .
94. 4x-2(x-3)-3[x-3(4-2x)+8] .
( 四) 将下列各式先化简,再求值
97. 已知a+b=2, a-b=-1 , 求3(a+b)2(a-b)2- 5(a+b)2 x (a -b)2 的值.