x+y=8,xy=15,求x^3y+2x^2y^2+xy^3
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x+y=8,xy=15,求x^3y+2x^2y^2+xy^3
![x+y=8,xy=15,求x^3y+2x^2y^2+xy^3](/uploads/image/z/16888857-33-7.jpg?t=x%2By%3D8%2Cxy%3D15%2C%E6%B1%82x%5E3y%2B2x%5E2y%5E2%2Bxy%5E3)
原式=xy(x²+2xy+y²)
=xy(x+y)²
=15×8²
=960
=xy(x+y)²
=15×8²
=960
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