∵1/x-1/y=4
∴(y-x)/xy=4
∴y-x=4xy
∴x-y=-4xy
(2x+xy-2y)/(x-2xy-y)
=[2(x-y)+xy]/[(x-y)-2xy]
=(-8xy+xy)/(-4xy-2xy)
=(-7xy)/(-6xy)
=7/6
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已知1/x-1/y=4,求(2x+xy-2y)/(x-2xy-y)
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