laughingwind 发表于 2018-6-26 17:33
The value of 1/11 + 1/12 + 1/13 + … + 1/20 will be
A. Less than 1/3
Lipyon 发表于 2018-6-26 18:12
你是在哪里找到的题哇
laughingwind 发表于 2018-6-26 17:33
The value of 1/11 + 1/12 + 1/13 + … + 1/20 will be
A. Less than 1/3
GGSam 发表于 2018-6-27 03:06
1/11 + 1/13 > 2/12
1/11 + 1/12 + 1/13)> 1/4, (1/13 + 1/14 + 1/15) > 1/5 , (1/17 + 1/18 + 1/19) > ...
Permy 发表于 2018-6-26 17:22
谢谢LL!LL能想回忆一下CR吗~~
Lipyon 发表于 2018-6-26 17:29
CR能回忆起来吗~
laughingwind 发表于 2018-6-26 17:33
The value of 1/11 + 1/12 + 1/13 + … + 1/20 will be
A. Less than 1/3
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