如有不明白，可以追问。如有帮助，记得采纳，谢谢
(y-x)/xy=5
y-x=5xy
则x-y=-5xy
所以原式=[2(x-y)-3xy]/[(x-y)+2xy]
=[2(-5xy)-3xy]/[(-5xy)+2xy]
=-13xy/(-3xy)
=13/3本回答被提问者采纳
已知1\/x-1\/y=5,2x-3xy-2y\/x+2xy-y的值
如有不明白，可以追问。如有帮助，记得采纳，谢谢
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