1．3ab-4ab+8ab-7ab+ab=______．
2．7x-(5x-5y)-y=______．
3．23a3bc2-15ab2c+8abc-24a3bc2-8abc=______．
4．-7x2+6x+13x2-4x-5x2=______．
5．2y+(-2y+5)-(3y+2)＝______．
6．(2x2-3xy+4y2)+(x2+2xy-3y2)=______．
7．2a-(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,計算A+B=______．
22．已知A=x3-2x2+x-4,B=2x3-5x+3,計算A-B=______．
23．若a=-0.2,b=0.5,代數(shù)式-(|a2b|-|ab2|)的值為______．
25．一個多項式減去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么這個多項式等于______．
26．-(2x2-y2)-[2y2-(x2+2xy)]=______．
27．若-3a3b2與5ax-1by+2是同類項,則x=______,y=______．
28．(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝______．
29．化簡代數(shù)式4x2-[7x2-5x-3(1-2x+x2)]的結(jié)果是______．
30．2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( )．
31．3a-(2a-3b)+3(a-2b)-b=______．
32．化簡代數(shù)式x-[y-2x-(x+y)]等于______．
33．[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1．
34．-2(3x+z)-(-6x)+(-5y+3z)=______．
35．-5an-an+1-(-7an+1)+(-3an)＝______．
36．3a-(2a-4b-6c)+3(-2c+2b)=______．
37．9a2+[7a2-2a-(-a2+3a)]=______．每道題都要帶括號7(x-3)-5(2x-1) m2+(-mn)-n2+(-m2)-(-0.5n2) 2x2-{-3x+6+[4x2-(2x2-3x+2)]} a-(a-3b+4c)+3(-c+2b) a-(a-3b+4c)+3(-c+2b) m2+(-mn)-n2+(-m2)-(-0.5n2) (3x-5y)-(6x+7y)+(9x-2y)3a-(2a-4b-6c)+3(-2c+2b)6-5b-(3a-2b)-(1-6b) (5x-4y-3xy)-(8x-y+2xy)