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3(xy^2-x^2y)-2(xy+xy^2)+3x^2y
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人气:327 ℃ 时间:2020-03-17 17:54:27
解答
3(xy^2-x^2y)-2(xy+xy^2)+3x^2y
=3xy(y-x)-2xy(1+y)+3x^2y
=xy(3y-3x-2-2y+3x)
=xy(y-2)
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