问题描述： 2m-｛n+[4m-3（m+2n）]｝-5n化简求值 1个回答 分类：数学 2014-10-18 问题解答： 我来补答 2m-{n+[4m-3(m+2n)]}-5n原式=2m-{n+[4m-3m-6n]}-5n =2m-n-4m+3m+6n-5n =2m-4m+3m-n+6n-5n =m 展开全文阅读
