已知x-y=1,xy=2,求x³y-2x²y²+xy³的值
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已知x-y=1,xy=2,求x³y-2x²y²+xy³的值
![已知x-y=1,xy=2,求x³y-2x²y²+xy³的值](/uploads/image/z/8646489-9-9.jpg?t=%E5%B7%B2%E7%9F%A5x-y%3D1%2Cxy%3D2%2C%E6%B1%82x%26%23179%3By-2x%26%23178%3By%26%23178%3B%2Bxy%26%23179%3B%E7%9A%84%E5%80%BC)
x³y-2x²y²+xy³
=xy(x²-2xy+y²)
=xy(x-y)²
=2X1
=2
=xy(x²-2xy+y²)
=xy(x-y)²
=2X1
=2
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