3ï¼3ab-4ab+8ab-7ab+ab=______ï¼
4ï¼7x-(5x-5y)-y=______ï¼
5ï¼23a3bc2-15ab2c+8abc-24a3bc2-8abc=______ï¼
6ï¼-7x2+6x+13x2-4x-5x2=______ï¼
7ï¼2y+(-2y+5)-(3y+2)ï¼______ï¼
11ï¼(2x2-3xy+4y2)+(x2+2xy-3y2)=______ï¼
12ï¼2a-(3a-2b+2)+(3a-4b-1)=______ï¼
13ï¼-6x2-7x2+15x2-2x2ï¼______ï¼
14ï¼2x-(x+3y)-(-x-y)-(x-y)ï¼______ï¼
16ï¼2x+2y-[3x-2(x-y)]=______ï¼
17ï¼5-(1-x)-1-(x-1)=______ï¼
18ï¼( )+(4xy+7x2-y2)=10x2-xyï¼
19ï¼(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3ï¼
21ï¼å·²ç¥A=x3-2x2+x-4,B=2x3-5x+3,计ç®A+B=______ï¼
22ï¼å·²ç¥A=x3-2x2+x-4,B=2x3-5x+3,计ç®A-B=______ï¼
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