已知1/x-1/y=-1,求(3x-2xy-3y)/(2x+xy-2y)的值.

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/05 17:24:04

1/x-1/y=-1
(y-x)/xy=-1
x-y=xy
(3x-2xy-3y)/(2x+xy-2y)
=[3(x-y)-2xy]/[2(x-y)+xy]
=(3xy-2xy)/(2xy+xy)
=xy/3xy
=1/3

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