已知x-y=-1,xy=3,求x³y-2x²y²+xy³的值
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已知x-y=-1,xy=3,求x³y-2x²y²+xy³的值
已知x-y=-1,xy=3,求x³y-2x²y²+xy³的值
已知x-y=-1,xy=3,求x³y-2x²y²+xy³的值
x^3y-2x^2y^2+xy^3
因式分解先
=xy(x^2-2xy+y^2)
=xy(x-y)^2
好了,全部代入
=3
原式=XY(X²-2XY+Y²)=XY(X-Y)²=3(-1)²=3