已知x+y分之xy=3求-2x+3xy-2y分之3x-5xy+3y的值
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已知x+y分之xy=3求-2x+3xy-2y分之3x-5xy+3y的值
![已知x+y分之xy=3求-2x+3xy-2y分之3x-5xy+3y的值](/uploads/image/z/2463664-40-4.jpg?t=%E5%B7%B2%E7%9F%A5x%2By%E5%88%86%E4%B9%8Bxy%3D3%E6%B1%82-2x%2B3xy-2y%E5%88%86%E4%B9%8B3x-5xy%2B3y%E7%9A%84%E5%80%BC)
∵(x+y)分之xy=3
∴xy=3(x+y)
∴(-2x+3xy-2y)分之(3x-5xy+3y)
=[-2(x+y)+9(x+y)]分之[3(x+y)-15(x+y)]
=[7(x+y)]分之[-12(x+y)]
=-7分之12
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∴xy=3(x+y)
∴(-2x+3xy-2y)分之(3x-5xy+3y)
=[-2(x+y)+9(x+y)]分之[3(x+y)-15(x+y)]
=[7(x+y)]分之[-12(x+y)]
=-7分之12
请点击下面的【选为满意回答】按钮.
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