3ab-4ab 8ab-7ab ab=______．
4．7x-(5x-5y)-y=______．
5．23a3bc2-15ab2c 8abc-24a3bc2-8abc=______．
6．-7×2 6x 13×2-4x-5×2=______．
7．2y (-2y 5)-(3y 2)＝______．
11．(2×2-3xy 4y2) (x2 2xy-3y2)=______．
12．2a-(3a-2b 2) (3a-4b-1)=______．
13．-6×2-7×2 15×2-2×2＝______．
14．2x-(x 3y)-(-x-y)-(x-y)＝______．
16．2x 2y-[3x-2(x-y)]=______．
17．5-(1-x)-1-(x-1)=______．
18．( ) (4xy 7×2-y2)=10×2-xy．
19．(4xy2-2x2y)-( )=x3-2x2y 4xy2 y3．
21．已知A=x3-2×2 x-4，B=2×3-5x 3，A B=______．
22．已知A=x3-2×2 x-4，B=2×3-5x 3，计算A-B=______．
23．若a=-0三年级计算题道。
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．-(2×2-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4×2-[7×2-5x-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 2×2-3xy-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=______．
．(4×2-8x 5)-(x3 3×2-6x 2)．
72．(0。
3×3-x2y xy2-y3)-(-0。5×3-x2y 0。3xy2)．
73．-{2a2b-[3abc-(4ab2-a2b)]｝．
74．(5a2b 3a2b2-ab2)-(-2ab2 3a2b2 a2b)．
75．(x2-2y2-z2)-(-y2 3×2-z2) (5×2-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．(-3×3 2×2-5x 1)-(5-6x-x2 x3)．
83．3x-(2x-4y-6x) 3(-2z 2y)．
84．(-x2 4 3×4-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)．
93。
2×2-｛-3x-[4×2-(3×2-x) (x-x2)]｝．
94：-(7x-y-2z)-｛[4x-(x-y-z)-3x z]-x｝．
95：( 3a) (-5a) (-7a) (-31a)-( 4a)-(-8a)．
96：a3-(a2-a) (a2-a 1)-(1-a4 a3)．
97．4x-2(x-3)-3[x-3(4-2x) 8]．
上面的题加参考资料上的，我想就够了哦~~。
