已知x-y=-1.xy=3,求x^3y-2x^2y^2+xy^3的值速求

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已知x-y=-1.xy=3,求x^3y-2x^2y^2+xy^3的值速求
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已知x-y=-1.xy=3,求x^3y-2x^2y^2+xy^3的值速求
已知x-y=-1.xy=3,求x^3y-2x^2y^2+xy^3的值
速求

已知x-y=-1.xy=3,求x^3y-2x^2y^2+xy^3的值速求
x^3y-2x^2y^2+xy^3
=xy(x^2-2xy+y^2)
=xy(x-y)^2
=3×(-1)^2=3

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