问题描述: 1/1x2+1/2x3+1/3x4+1/4x5.1/2005x2006=? 1个回答 分类:数学 2014-10-27 问题解答: 我来补答 1/1x2+1/2x3+1/3x4+1/4x5.1/2005x2006=1-1/2+1/2-1/3+1/3-1/4+……+1/2005 -1/2006 =1-1/2006=2005/2006 展开全文阅读