已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
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![已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值](/uploads/image/z/559271-47-1.jpg?t=%E5%B7%B2%E7%9F%A5xy%3D2%28x%2By%29%2C%E6%B1%82%285x-xy%2B5y%29%2F%283xy-x-y%29%E7%9A%84%E5%80%BC)
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
(5x-xy+5y)/(3xy-x-y)=[5(x+y)-xy]/[3xy-(x+y)]
=[5(x+y)-2(x+y)]/[6(x+y)-(x+y)]
=1/2
(5x-xy+5y)/(3xy-x-y)
=[5(x+y)-xy]/[3xy-(x+y)]
将x*y替换
得1/2
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