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)=______.
8.-6x2-7x2+15x2-2x2=______.
9.2x-(x+3y)-(-x-y)-(x-y)=______.
10.2x+2y-[3x-2(x-y)]=______.
11.5-(1-x)-1-(x-1)=______.
12.( )+(4xy+7x2-y2)=10x2-xy.
13.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.
14.å·²ç¥A=x3-2x2+x-4,B=2x3-5x+3,计ç®A+B=______.
15.å·²ç¥A=x3-2x2+x-4,B=2x3-5x+3,计ç®A-B=______.
16.è¥a=-0.2,b=0.5,代æ°å¼-(|a2b|-|ab2|)çå¼ä¸º______.
17.ä¸ä¸ªå¤é¡¹å¼åå»3m4-m3-2m+5å¾-2m4-3m3-2m2-1,é£ä¹è¿ä¸ªå¤é¡¹å¼çäº______.
18.-(2x2-y2)-[2y2-(x2+2xy)]=______.
19.è¥-3a3b2ä¸5ax-1by+2æ¯å类项,åx=______,y=______.
20.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.
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