xy(2x+y)^2计算
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xy(2x+y)^2计算xy(2x+y)^2计算xy(2x+y)^2计算4x^3y+4x^2y^2+xy^3
xy(2x+y)^2计算
xy(2x+y)^2计算
xy(2x+y)^2计算
4x^3y+4x^2y^2+xy^3
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xy(2x+y)^2计算
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