已知1/x-1/y=2,求x-y-5xy/2x-2y+3xy

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已知1/x-1/y=2,求x-y-5xy/2x-2y+3xy已知1/x-1/y=2,求x-y-5xy/2x-2y+3xy已知1/x-1/y=2,求x-y-5xy/2x-2y+3xy通分1/x-1/y=

已知1/x-1/y=2,求x-y-5xy/2x-2y+3xy
已知1/x-1/y=2,求x-y-5xy/2x-2y+3xy

已知1/x-1/y=2,求x-y-5xy/2x-2y+3xy
通分
1/x-1/y=(y-x)/xy=2
y-x=2xy
所以x-y=-2xy
原式=[(x-y)-5xy]/[2(x-y)+3xy]
=[(-2xy)-5xy]/[2(-2xy)+3xy]
=-7xy/(-xy)
=7

1/x-1/y=(y-x)/(xy)=2
y-x=2xy
x-y=-2xy
(x-y-5xy)/(2x-2y+3xy)
=(-2xy-5xy)/(-4xy+3xy)
=(-7xy)/(-xy)
=7

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