1/2+1/6+1/12+1/20+1/30+1/42等于多么的过程_数学解答

1/2+1/6+1/12+1/20+1/30+1/42等于多么的过程

人气：140 ℃　时间：2020-06-24 01:07:27

解答

1/2+1/6+1/12+1/20+1/30+1/42
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7