1、-3x²y+2x²y+3xy²-2xy² 2、4a²+3b²+ab-4a²-2b²+2ab-1合并同类项
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1、-3x²y+2x²y+3xy²-2xy² 2、4a²+3b²+ab-4a²-2b²+2ab-1合并同类项
1、-3x²y+2x²y+3xy²-2xy² 2、4a²+3b²+ab-4a²-2b²+2ab-1
合并同类项
1、-3x²y+2x²y+3xy²-2xy² 2、4a²+3b²+ab-4a²-2b²+2ab-1合并同类项
1、-3x²y+2x²y+3xy²-2xy²
=-x²y+xy²
=xy(y-x)
2、4a²+3b²+ab-4a²-2b²+2ab-1
=b²+3ab-1
解1:xy(-x+y) 2:b2+3ab-1