第1个回答 2019-08-15
化简求值:3ab-4ab
8ab-7ab
ab=______.
7x-(5x-5y)-y=______.
23a3bc2-15ab2c
8abc-24a3bc2-8abc=______.
-7x2
6x
13x2-4x-5x2=______.
.2y
(-2y
5)-(3y
2)=______.
.(2x2-3xy
4y2)
(x2
2xy-3y2)=______.
2a-(3a-2b
2)
(3a-4b-1)=______.
-6x2-7x2
15x2-2x2=______.
2x-(x
3y)-(-x-y)-(x-y)=______.
2x
2y-[3x-2(x-y)]=______.
5-(1-x)-1-(x-1)=______.
(
)
(4xy
7x2-y2)=10x2-xy.
(4xy2-2x2y)-(
)=x3-2x2y
4xy2
y3.
已知a=x3-2x2
x-4,b=2x3-5x
3,计算a
b=______.
已知a=x3-2x2
x-4,b=2x3-5x
3,计算a-b=______.
若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______.
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______.
-(2x2-y2)-[2y2-(x2
2xy)]=______.
若-3a3b2与5ax-1by
2是同类项,则x=______,y=______.
(-y
6
3y4-y3)-(2y2-3y3
y4-7)=______.
化简代数式4x2-[7x2-5x-3(1-2x
x2)]的结果是______.
2a-b2
c-d3=2a
(
)-d3=2a-d3-(
)=c-(
).
3a-(2a-3b)
3(a-2b)-b=______.
化简代数式x-[y-2x-(x
y)]等于______.
[5a2
(
)a-7]
[(
)a2-4a
(
)]=a2
2a
1.
3x-[y-(2x
y)]=______.
化简|1-x
y|-|x-y|(其中x<0,y>0)等于______.
.已知x≤y,x
y-|x-y|=______.
已知x<0,y<0,化简|x
y|-|5-x-y|=______.
4a2n-an-(3an-2a2n)=______.
若一个多项式加上-3x2y
2x2-3xy-4得
2x2y
3xy2-x2
2xy,
则这个多项式为______.
-5xm-xm-(-7xm)
(-3xm)=______.
当a=-1,b=-2时,
[a-(b-c)]-[-b-(-c-a)]=______.
当a=-1,b=1,c=-1时,
-[b-2(-5a)]-(-3b
5c)=______.
-2(3x
z)-(-6x)
(-5y
3z)=______.
.-5an-an
1-(-7an
1)
(-3an)=______.
3a-(2a-4b-6c)
3(-2c
2b)=______.
9a2
[7a2-2a-(-a2
3a)]=______.
当2y-x=5时,5(x-2y)2-3(-x
2y)-100=______.
2x―[6-2(x-2)]
其中
x=-2
(5a+2a2-3-4a3)-(-a+3a3-a2),其中a=-2