Question

希望大家帮帮我哈,有道数学题不会做了,谢谢大家哈,请大家写下解题思路

Answer 1

A=1+1/2+1/3+1/4+...+1/11+1/12

>1+1/2+1/3+1/4+(1/6+1/6)+(1/9+1/9+1/9)+(1/12+1/12+1/12)

=1+1/2+1/3+1/4+1/3+1/3+1/4

=3

A=1+1/2+1/3+1/4+...+1/11+1/12