问题描述： 详细过程，数别变，比如把1/6变成1/2，不行不行 五年级 1个回答 分类：数学 2020-06-27 问题解答： 我来补答 解法一： 1/6+1/12+1/20+1/30+1/42 =1/(2x3)+1/(3x4)+1/(4x5)+1/(5x6)+1/(6x7) =(1/2-1/3)+(1/3-1/4)+……+(1/6-1/7) =1/2-1/7 =5/14 解法二： 1/6+1/12+1/20+1/30+1/42 =(1/6+1/12)+(1/20+1/30)+1/42 =1/4+1/12+1/42 =1/3+1/42 =5/14 展开全文阅读
