已知2x-y=1,xy=3则4x^3y-4x^2y^2+xy^3=jjjjjjjjjjjjjj

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已知2x-y=1,xy=3则4x^3y-4x^2y^2+xy^3=jjjjjjjjjjjjjj已知2x-y=1,xy=3则4x^3y-4x^2y^2+xy^3=jjjjjjjjjjjjjj已知2x-y

已知2x-y=1,xy=3则4x^3y-4x^2y^2+xy^3=jjjjjjjjjjjjjj
已知2x-y=1,xy=3则4x^3y-4x^2y^2+xy^3=
jjjjjjjjjjjjjj

已知2x-y=1,xy=3则4x^3y-4x^2y^2+xy^3=jjjjjjjjjjjjjj
4x^3y-4x^2y^2+xy^3=xy(4x^2-4xy+y^2)=xy(2x-y)^2
因为2x-y=1,xy=3
所以原式=3*1=3