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2x2y3+y+3xy 2x2y2﹣2y+3xy 2x2y3+2y﹣3xy 2x2y3+y﹣3xy
3x2y与3xy2 3xy与﹣2xy2 ﹣2xy2与﹣2ab2 0与π
3x2y-4xy2; x2y-4xy2; x2y+2xy2; -x2y-2xy2
4xy+xy=5xy x+2x=2x² 5xy-3xy=2 x+y=xy
xy(2x-2y)2 2xy(x-y)2 4xy(x2-2xy+y2) 4xy(x-y)2
12xy-4x 12xy-10x 12xy-8x 12xy-2x
3m﹣m=2 a2b﹣ab2=0 xy﹣2xy=﹣xy 2x+2y=5xy
3m﹣m=2 a2b﹣ab2=0 2x+3y=5xy xy﹣2xy=﹣xy
2x+2y=2xy (x2y3)2=x4y5 (xy)2÷=(xy)3 2xy﹣3yx=xy
3a2+a2=3a4 8xy﹣7xy=xy 3x2y﹣xy2=2x2y 3a+b=3ab
2x+2y=2xy (x2y3)2=x4y5 (xy)2÷=(xy)3 2xy﹣3yx=xy