已知x-y=xy,求(2x-xy-2y)/(x-2xy-y)的值
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已知x-y=xy,求(2x-xy-2y)/(x-2xy-y)的值已知x-y=xy,求(2x-xy-2y)/(x-2xy-y)的值已知x-y=xy,求(2x-xy-2y)/(x-2xy-y)的值x-y=
已知x-y=xy,求(2x-xy-2y)/(x-2xy-y)的值
已知x-y=xy,求(2x-xy-2y)/(x-2xy-y)的值
已知x-y=xy,求(2x-xy-2y)/(x-2xy-y)的值
x-y=xy
2x-xy-2y=2xy-xy=xy
x-2xy-y=xy-2xy=-xy
所以(2x-xy-2y)/(x-2xy-y)=xy/-xy=-1
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