整式加减混合运算
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(1) 7-3x-4x2 +4x-8x2 -15 (2) 2(2a2 -9b)-3(－4a2 +b) (3) 8x2-[-3x-(2x2-7x-5)+3]+4x (4)(5x-3y-2xy)-(6x+5y-2xy)
(5) 3a2b－[2ab2－2（ab－1.5a2b）+ab]+3ab2
(6)2x－3y）+（5x+4y）(7)（8a－7b）－（4a－5b）
(8) －（3x－2y + z）－[5x－(x－2y +z ) －3x]
(9)2（7x2+5x－3）－3（5x2－3x+2）
(10)2b3 +（3ab3－a2b）－2（ab2 + b3）
(11)（－6x2+5xy）－12xy－（2x2－9xy）
(12)（x2－2x3 +1）－(－1+2x3 + 2x2)，其中x=2
(13)3a－[－2b+（4a－3b）]，其中a=－1，b=3
(14)3ab-4ab+8ab-7ab+ab= (15)7x-(5x-5y)-y=
(16)23a3bc2-15ab2c+8abc-24a3bc2-8abc=
(17)-7x2+6x+13x2-4x-5x2= (18)2y+(-2y+5)-(3y+2)＝(19)(2x2-3xy+4y2)+(x2+2xy-3y2)= (20)2a-(3a-2b+2)+(3a-4b-1)= (21) -6x2-7x2+15x2-2x2＝(22)2x-(x+3y)-(-x-y)-(x-y)＝(23)2x+2y-[3x-2(x-y)]= 5-(1-x)-1-(x-1)=
(24)已知A=x3-2x2+x-4，B=2x3-5x+3，计算A+B=
(25)若a=-0.2，b=0.5，代数式-(|a2b|-|ab2|)的值为
(26)-(2x2-y2)-[2y2-(x2+2xy)]= (27)(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝
(28)4x2-[7x2-5x-3(1-2x+x2)]=
(29)3a-(2a-3b)+3(a-2b)-b=
(30)x-[y-2x-(x+y)] = 3x-[y-(2x+y)]=
(31)4a2n-an-(3an-2a2n)＝
(32)2x2y+3xy2-x2+2xy=
(33)-5xm-xm-(-7xm)+(-3xm)=
(34)当a=-1，b=-2时，[a-(b-c)]-[-b-(-c-a)]＝
(35)当a=-1，b=1，c=-1时，-[b-2(-5a)]-(-3b+5c)＝
(36)-2(3x+z)-(-6x)+(-5y+3z)=
(37)-5an-an+1-(-7an+1)+(-3an)＝
(38)3a-(2a-4b-6c)+3(-2c+2b)=
(39)9a2+[7a2-2a-(-a2+3a)]=
(40)当2y-x=5时，5(x-2y)2-3(-x+2y)-100=
(41)3ab-4ab+8ab-7ab+ab=
(42)7x-(5x-5y)-y=
(43)23a3bc2-15ab2c+8abc-24a3bc2-8abc=
(44)-7x2+6x+13x2-4x-5x2=______.
(45)2y+(-2y+5)-(3y+2)=______.
(46)(2x2-3xy+4y2)+(x2+2xy-3y2)=______.
(47)2a-(3a-2b+2)+(3a-4b-1)=______.
(48)-6x2-7x2+15x2-2x2=______.
(49)2x-(x+3y)-(-x-y)-(x-y)=______.
(50)2x+2y-[3x-2(x-y)]=______.
(51)5-(1-x)-1-(x-1)=______.
(52)( )+(4xy+7x2-y2)=10x2-xy.
(53)(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.
(54)已知A=x3-2x2+x-4，B=2x3-5x+3，计算A+B=______.
(55)已知A=x3-2x2+x-4，B=2x3-5x+3，计算A-B=______.
(56)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得-2m4-3m3-2m2-1，那么这个多项式等于______.
(57)-(2x2-y2)-[2y2-(x2+2xy)]=______.
(58)若-3a3b2与5ax-1by+2是同类项，则x=______，y=______.
(59)(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.
(60)化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______.
(61)2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ).
(62)3a-(2a-3b)+3(a-2b)-b=______.
(63)化简代数式x-[y-2x-(x+y)]=______.
(64)[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1.
(65)3x-[y-(2x+y)]=______.
(66)化简|1-x+y|-|x-y|(其中x＜0，y＞0)等于______.
(67)已知x≤y，x+y-|x-y|=______.
(68)已知x＜0，y＜0，化简|x+y|-|5-x-y|=______.
(69)4a2n-an-(3an-2a2n)=______.
(70)若一个多项式加上-3x2y+2x2-3xy-4得2x2y+3xy2-x2+2xy，则
这个多项式为______.
(71)-5xm-xm-(-7xm)+(-3xm)=______.
(72)当a=-1，b=-2时，[a-(b-c)]-[-b-(-c-a)]=______.
(73)当a=-1，b=1，c=-1时，-[b-2(-5a)]-(-3b+5c)=______.
(74)-2(3x+z)-(-6x)+(-5y+3z)=______.
(75)-5an-an+1-(-7an+1)+(-3an)=______.