问题描述: 1-1/2+1/6+1/12+1/20+1/30+1/42+1/36,能简便的要简便计算 1个回答 分类:数学 2014-11-04 问题解答: 我来补答 1-1/2+1/6+1/12+1/20+1/30+1/42+1/56=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8=1-1/8=7/8 展开全文阅读