问题描述: 已知x分之一减y分之一等于5,则代数式(2x-11xy-2y)\(x-2xy-y)的值为 1个回答 分类:数学 2014-11-01 问题解答: 我来补答 1/x-1/y=5y/(xy)-x/(xy)=5y-x=5xyx-y=-5xy(2x-11xy-2y)/(x-2xy-y)=[2(x-y)-11xy]/(x-y-2xy)=[2(-5xy)-11xy]/(-5xy-2xy)=(-21xy)/(-7xy)=3 展开全文阅读