(1)1+1/2+1/3+1/4+1/5+1/6+1/7+1/14+1/28

问题描述:

(1)1+1/2+1/3+1/4+1/5+1/6+1/7+1/14+1/28

1+(1/2+1/3+1/6)+(1/4+1/7+1/14+1/28)+1/5=2.7