问题描述: 1/2=1-1/2,1/6=1/2-1/3,1/12=1/3-1/4...请根据以上的规律计算:1/6+1/12+1/20+1/30+1/42 1个回答 分类:数学 2014-11-13 问题解答: 我来补答 1/6+1/12+1/20+1/30+1/42=(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7=1/2-(1/3-1/3)-(1/4-1/4)-(1/5-1/5)-(1/6-1/6)-1/7=1/2-0-0-0-0-1/7=5/14 展开全文阅读