已知x-y=-1,xy=3.求x^3y-2x^2y^2+xy^3的值快
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已知x-y=-1,xy=3.求x^3y-2x^2y^2+xy^3的值快
已知x-y=-1,xy=3.求x^3y-2x^2y^2+xy^3的值
快
已知x-y=-1,xy=3.求x^3y-2x^2y^2+xy^3的值快
x^3y-2x^2y^2+xy^3
=xy(x²-2xy+y²)
=xy(x-y)²
=3(-1)²
=3