1/x-1/y=3,则求3y+xy-3x/2x-xy-2y

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1/x-1/y=3,则求3y+xy-3x/2x-xy-2y
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1/x-1/y=3,则求3y+xy-3x/2x-xy-2y
1/x-1/y=3,则求3y+xy-3x/2x-xy-2y

1/x-1/y=3,则求3y+xy-3x/2x-xy-2y
y-x=3xy
(3y+xy-3x)/(2x-xy-2y)=10xy/(-7xy)=10/7

将一已知式,化简成Y-X=3XY,再把未知式的XY用Y-X代替,上下约分就好了