已知x+y分之xy=3求3xy-x-y分之2x-3xy+2y的值
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已知x+y分之xy=3求3xy-x-y分之2x-3xy+2y的值
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![已知x+y分之xy=3求3xy-x-y分之2x-3xy+2y的值](/uploads/image/z/177359-23-9.jpg?t=%E5%B7%B2%E7%9F%A5x%2By%E5%88%86%E4%B9%8Bxy%3D3%E6%B1%823xy-x-y%E5%88%86%E4%B9%8B2x-3xy%2B2y%E7%9A%84%E5%80%BC)
xy/(x+y)=3,xy=3(x+y)
(2x-3xy+2y)/(3xy-x-y)
=[-(3xy-x-y)+x+y]/(3xy-x-y)
=-1+ (x+y)/(3xy-x-y)
=-1 +(x+y)/[3(x+y)-(x+y)]
=-1+1/2=-1/2
(2x-3xy+2y)/(3xy-x-y)
=[-(3xy-x-y)+x+y]/(3xy-x-y)
=-1+ (x+y)/(3xy-x-y)
=-1 +(x+y)/[3(x+y)-(x+y)]
=-1+1/2=-1/2
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