Question

初一下册合并同类项化简求值解方程

Answer 1

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