已知1/x-1/y=2,求3x+xy-3y/y-xy-x的值
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已知1/x-1/y=2,求3x+xy-3y/y-xy-x的值
![已知1/x-1/y=2,求3x+xy-3y/y-xy-x的值](/uploads/image/z/17818696-64-6.jpg?t=%E5%B7%B2%E7%9F%A51%2Fx-1%2Fy%3D2%2C%E6%B1%823x%2Bxy-3y%2Fy-xy-x%E7%9A%84%E5%80%BC)
1/x-1/y=2
(y-x)/xy=2
y-x=2xy
(3x+xy-3y)/(y-xy-x)
=[-3(y-x)+xy]/[(y-x)-xy]
=[(-6+1)xy]/[(2-1)xy]
=-5
(y-x)/xy=2
y-x=2xy
(3x+xy-3y)/(y-xy-x)
=[-3(y-x)+xy]/[(y-x)-xy]
=[(-6+1)xy]/[(2-1)xy]
=-5
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