问题描述: 已知1/x-1/y=5,求分式3x+5xy-3y/x-3xy-y的值. 1个回答 分类:数学 2014-12-02 问题解答: 我来补答 1/x-1/y=5(y-x)/xy=5y-x=5xyx-y=-5xy3x+5xy-3y/x-3xy-y=3(x-y)+5xy/(x-y)-3xy=3*(-5xy)+5xy/-5xy-3xy=-10xy/-8xy=5/4 展开全文阅读