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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.
19.(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得-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,则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<0,y>0)等于______.
36.已知x≤y,x+y-|x-y|=______.
37.已知x<0,y<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=______.
小屁伢自几写
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.
19.(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得-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,则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<0,y>0)等于______.
36.已知x≤y,x+y-|x-y|=______.
37.已知x<0,y<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=______.
小屁伢自几写
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(1)已知,a+b=4,ab=-2,求代数式(4a-3b-2ab)-(a-6b-ab)的值.
(2)5(3a2b-ab2)-4(-3ab2+2a2b),其中a=-2,b=3
(3)其中m=-2 n=-3 [(m-2n)²+(m-2n)(m-2n)-2m(m-n)+2m³]/2m c)(a-b+c)-c(a+b)
(4)已知(ab+1)2+|a+b-2|=0,先化简再求值:(2a-b-1)-(a+2b)(a-b).
(5):(3x+2)(3x-2)-5x(x-1)-(2x-1)²,其中=-1/3
(6)已知x2-2x=2 ,先化简再求值(x-1)2+(x+3)(x-3)+(x+3)(x-1)的值
(7) (a2+b2)(a2-b2)-(a+b)2(a-b)2,其中a=4,b=1
(8)8m-(6m2+15m2n)/3m+m(n-1),其中m=2,n=1
(9)(a-2b)²-a(a-b)+2ab,其中a=1/2,b=1
(10)[(x-y)2+(x+y)(x-y)]·2x其中x=3 y=-1.5
(11) 6m2-5m(-m+2n-1)+4m(-3m-5/2n-3/4),其中m=-1,n=2.
(12)(4x2y-5y2x)-(3x2y-4xy2),其中x=--1,y=2\1
(13)(x-3)2-x(x-8),其中x=2-4
(14) (x+y)(x-Y)+(x-Y)²-(6x²y-2xy²)÷(2xy),当x=-2,y=1/3
(15)(25a2-5a+1)(5a+1-5(1+2a)(2a-1)的值,其中a=2/5
(16)-8x2-5x(-x+3y)+(3x+2y)(x-y),其中x=2,y=-1.
(17)x(x3+x2-x+1)-(x2+x-2),其中x=-三分之二
(18)x(x-4)(x+4)-(x+3)(x2_6x+9)+(5x3y2)÷(x2y2),其中x=-3
(19)(5y+1)(5y-1)-5(y+25y2),其中y=2/5
(20)(a+b)2-(a-b)2-4ab,其中a=1998,b=1997
(21)(5b-b2+1)-(5a-a2+1) 其中a+b=5 ab= -2
(22)(3ab-a²)-[2a²-(3ab-b²)],其中a=-2,b=1
(23)(a-b)2+b(a-b)-(-a+2b)(-a-2b),其中a=2,b=-1/2
(24)4x3-[-x2+2(x3- 1/3x2)] 其中x=-3
(25)4(x+1)2-7(x-1)(x+1)+3(1-x)2 其中X=1/2
(26)(2a+)2-(2a-b)(a+b)-2(a-2b)(a+2b),其中x=-2,y=二分之一
(27)[(2a+b)²+(2a-b)²](4a²-b²),其中a=-2分之1,b=3
(28)[(2a+b)^2+(2a+b)×(b-2a)-6b]÷2b,其中a=﹣0.5,b=3
(29)[(2x-y)2-x(4x-y)+8y2]除以3y,其中x=3/4, y=-1/2.
(30)2(a²b﹢ab²)-2(a²b-1)-2ab²-2ab,其中a=1,b=﹣1
(2)5(3a2b-ab2)-4(-3ab2+2a2b),其中a=-2,b=3
(3)其中m=-2 n=-3 [(m-2n)²+(m-2n)(m-2n)-2m(m-n)+2m³]/2m c)(a-b+c)-c(a+b)
(4)已知(ab+1)2+|a+b-2|=0,先化简再求值:(2a-b-1)-(a+2b)(a-b).
(5):(3x+2)(3x-2)-5x(x-1)-(2x-1)²,其中=-1/3
(6)已知x2-2x=2 ,先化简再求值(x-1)2+(x+3)(x-3)+(x+3)(x-1)的值
(7) (a2+b2)(a2-b2)-(a+b)2(a-b)2,其中a=4,b=1
(8)8m-(6m2+15m2n)/3m+m(n-1),其中m=2,n=1
(9)(a-2b)²-a(a-b)+2ab,其中a=1/2,b=1
(10)[(x-y)2+(x+y)(x-y)]·2x其中x=3 y=-1.5
(11) 6m2-5m(-m+2n-1)+4m(-3m-5/2n-3/4),其中m=-1,n=2.
(12)(4x2y-5y2x)-(3x2y-4xy2),其中x=--1,y=2\1
(13)(x-3)2-x(x-8),其中x=2-4
(14) (x+y)(x-Y)+(x-Y)²-(6x²y-2xy²)÷(2xy),当x=-2,y=1/3
(15)(25a2-5a+1)(5a+1-5(1+2a)(2a-1)的值,其中a=2/5
(16)-8x2-5x(-x+3y)+(3x+2y)(x-y),其中x=2,y=-1.
(17)x(x3+x2-x+1)-(x2+x-2),其中x=-三分之二
(18)x(x-4)(x+4)-(x+3)(x2_6x+9)+(5x3y2)÷(x2y2),其中x=-3
(19)(5y+1)(5y-1)-5(y+25y2),其中y=2/5
(20)(a+b)2-(a-b)2-4ab,其中a=1998,b=1997
(21)(5b-b2+1)-(5a-a2+1) 其中a+b=5 ab= -2
(22)(3ab-a²)-[2a²-(3ab-b²)],其中a=-2,b=1
(23)(a-b)2+b(a-b)-(-a+2b)(-a-2b),其中a=2,b=-1/2
(24)4x3-[-x2+2(x3- 1/3x2)] 其中x=-3
(25)4(x+1)2-7(x-1)(x+1)+3(1-x)2 其中X=1/2
(26)(2a+)2-(2a-b)(a+b)-2(a-2b)(a+2b),其中x=-2,y=二分之一
(27)[(2a+b)²+(2a-b)²](4a²-b²),其中a=-2分之1,b=3
(28)[(2a+b)^2+(2a+b)×(b-2a)-6b]÷2b,其中a=﹣0.5,b=3
(29)[(2x-y)2-x(4x-y)+8y2]除以3y,其中x=3/4, y=-1/2.
(30)2(a²b﹢ab²)-2(a²b-1)-2ab²-2ab,其中a=1,b=﹣1
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(1)已知,a+b=4,ab=-2,求代数式(4a-3b-2ab)-(a-6b-ab)的值.
(2)5(3a2b-ab2)-4(-3ab2+2a2b),其中a=-2,b=3
(3)其中m=-2 n=-3 [(m-2n)²+(m-2n)(m-2n)-2m(m-n)+2m³]/2m c)(a-b+c)-c(a+b)
(4)已知(ab+1)2+|a+b-2|=0,先化简再求值:(2a-b-1)-(a+2b)(a-b).
(5):(3x+2)(3x-2)-5x(x-1)-(2x-1)²,其中=-1/3
(6)已知x2-2x=2 ,先化简再求值(x-1)2+(x+3)(x-3)+(x+3)(x-1)的值
(7) (a2+b2)(a2-b2)-(a+b)2(a-b)2,其中a=4,b=1
(8)8m-(6m2+15m2n)/3m+m(n-1),其中m=2,n=1
(9)(a-2b)²-a(a-b)+2ab,其中a=1/2,b=1
(10)[(x-y)2+(x+y)(x-y)]·2x其中x=3 y=-1.5
(11) 6m2-5m(-m+2n-1)+4m(-3m-5/2n-3/4),其中m=-1,n=2.
(12)(4x2y-5y2x)-(3x2y-4xy2),其中x=--1,y=2\1
(13)(x-3)2-x(x-8),其中x=2-4
(14) (x+y)(x-Y)+(x-Y)²-(6x²y-2xy²)÷(2xy),当x=-2,y=1/3
(15)(25a2-5a+1)(5a+1-5(1+2a)(2a-1)的值,其中a=2/5
(16)-8x2-5x(-x+3y)+(3x+2y)(x-y),其中x=2,y=-1.
(17)x(x3+x2-x+1)-(x2+x-2),其中x=-三分之二
(18)x(x-4)(x+4)-(x+3)(x2_6x+9)+(5x3y2)÷(x2y2),其中x=-3
(19)(5y+1)(5y-1)-5(y+25y2),其中y=2/5
(20)(a+b)2-(a-b)2-4ab,其中a=1998,b=1997
(21)(5b-b2+1)-(5a-a2+1) 其中a+b=5 ab= -2
(22)(3ab-a²)-[2a²-(3ab-b²)],其中a=-2,b=1
(23)(a-b)2+b(a-b)-(-a+2b)(-a-2b),其中a=2,b=-1/2
(24)4x3-[-x2+2(x3- 1/3x2)] 其中x=-3
(25)4(x+1)2-7(x-1)(x+1)+3(1-x)2 其中X=1/2
(26)(2a+)2-(2a-b)(a+b)-2(a-2b)(a+2b),其中x=-2,y=二分之一
(27)[(2a+b)²+(2a-b)²](4a²-b²),其中a=-2分之1,b=3
(28)[(2a+b)^2+(2a+b)×(b-2a)-6b]÷2b,其中a=﹣0.5,b=3
(29)[(2x-y)2-x(4x-y)+8y2]除以3y,其中x=3/4, y=-1/2.
(30)2(a²b﹢ab²)-2(a²b-1)-2ab²-2ab,其中a=1,b=﹣1
(2)5(3a2b-ab2)-4(-3ab2+2a2b),其中a=-2,b=3
(3)其中m=-2 n=-3 [(m-2n)²+(m-2n)(m-2n)-2m(m-n)+2m³]/2m c)(a-b+c)-c(a+b)
(4)已知(ab+1)2+|a+b-2|=0,先化简再求值:(2a-b-1)-(a+2b)(a-b).
(5):(3x+2)(3x-2)-5x(x-1)-(2x-1)²,其中=-1/3
(6)已知x2-2x=2 ,先化简再求值(x-1)2+(x+3)(x-3)+(x+3)(x-1)的值
(7) (a2+b2)(a2-b2)-(a+b)2(a-b)2,其中a=4,b=1
(8)8m-(6m2+15m2n)/3m+m(n-1),其中m=2,n=1
(9)(a-2b)²-a(a-b)+2ab,其中a=1/2,b=1
(10)[(x-y)2+(x+y)(x-y)]·2x其中x=3 y=-1.5
(11) 6m2-5m(-m+2n-1)+4m(-3m-5/2n-3/4),其中m=-1,n=2.
(12)(4x2y-5y2x)-(3x2y-4xy2),其中x=--1,y=2\1
(13)(x-3)2-x(x-8),其中x=2-4
(14) (x+y)(x-Y)+(x-Y)²-(6x²y-2xy²)÷(2xy),当x=-2,y=1/3
(15)(25a2-5a+1)(5a+1-5(1+2a)(2a-1)的值,其中a=2/5
(16)-8x2-5x(-x+3y)+(3x+2y)(x-y),其中x=2,y=-1.
(17)x(x3+x2-x+1)-(x2+x-2),其中x=-三分之二
(18)x(x-4)(x+4)-(x+3)(x2_6x+9)+(5x3y2)÷(x2y2),其中x=-3
(19)(5y+1)(5y-1)-5(y+25y2),其中y=2/5
(20)(a+b)2-(a-b)2-4ab,其中a=1998,b=1997
(21)(5b-b2+1)-(5a-a2+1) 其中a+b=5 ab= -2
(22)(3ab-a²)-[2a²-(3ab-b²)],其中a=-2,b=1
(23)(a-b)2+b(a-b)-(-a+2b)(-a-2b),其中a=2,b=-1/2
(24)4x3-[-x2+2(x3- 1/3x2)] 其中x=-3
(25)4(x+1)2-7(x-1)(x+1)+3(1-x)2 其中X=1/2
(26)(2a+)2-(2a-b)(a+b)-2(a-2b)(a+2b),其中x=-2,y=二分之一
(27)[(2a+b)²+(2a-b)²](4a²-b²),其中a=-2分之1,b=3
(28)[(2a+b)^2+(2a+b)×(b-2a)-6b]÷2b,其中a=﹣0.5,b=3
(29)[(2x-y)2-x(4x-y)+8y2]除以3y,其中x=3/4, y=-1/2.
(30)2(a²b﹢ab²)-2(a²b-1)-2ab²-2ab,其中a=1,b=﹣1
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