已知2x-y=1/3,xy=3求4x^3y-4x^2y^2+xy^3的值

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已知2x-y=1/3,xy=3求4x^3y-4x^2y^2+xy^3的值已知2x-y=1/3,xy=3求4x^3y-4x^2y^2+xy^3的值已知2x-y=1/3,xy=3求4x^3y-4x^2y^

已知2x-y=1/3,xy=3求4x^3y-4x^2y^2+xy^3的值
已知2x-y=1/3,xy=3求4x^3y-4x^2y^2+xy^3的值

已知2x-y=1/3,xy=3求4x^3y-4x^2y^2+xy^3的值
4x^3y-4x^2y^2+xy^3
=xy(4x^2-4xy+y^2)
=xy(2x-y)^2
=3*(1/3^2)
=1/3