已知1/x-1/y=3则分式(2x+3xy-2y)/(x-2xy-y)的值为

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已知1/x-1/y=3则分式(2x+3xy-2y)/(x-2xy-y)的值为已知1/x-1/y=3则分式(2x+3xy-2y)/(x-2xy-y)的值为已知1/x-1/y=3则分式(2x+3xy-2y

已知1/x-1/y=3则分式(2x+3xy-2y)/(x-2xy-y)的值为
已知1/x-1/y=3则分式(2x+3xy-2y)/(x-2xy-y)的值为

已知1/x-1/y=3则分式(2x+3xy-2y)/(x-2xy-y)的值为
1/x-1/y=3
通分
(y-x)/xy=3
y-x=3xy
x-y=-3xy
原式=[2(x-y)+3xy]/[(x-y)-2xy]
=(-6xy+3xy)/(-3xy-2xy)
=-3xy/(-5xy)
=3/5