已知X2+y2=7,Xy=-2,求多项式5X2一3Xy-4y2-11Xy-7X2+2y2的值.
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![已知X2+y2=7,Xy=-2,求多项式5X2一3Xy-4y2-11Xy-7X2+2y2的值.](/uploads/image/z/7120991-47-1.jpg?t=%E5%B7%B2%E7%9F%A5X2%2By2%3D7%2CXy%3D-2%2C%E6%B1%82%E5%A4%9A%E9%A1%B9%E5%BC%8F5X2%E4%B8%803Xy-4y2-11Xy-7X2%2B2y2%E7%9A%84%E5%80%BC.)
已知X2+y2=7,Xy=-2,求多项式5X2一3Xy-4y2-11Xy-7X2+2y2的值.
已知X2+y2=7,Xy=-2,求多项式5X2一3Xy-4y2-11Xy-7X2+2y2的值.
已知X2+y2=7,Xy=-2,求多项式5X2一3Xy-4y2-11Xy-7X2+2y2的值.
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