作者henry9621205 (清心小子)
看板trans_math
標題[考古] 98台大(B)第五題
時間Tue Jun 29 23:39:05 2010
00
Σ {[(2^(1/2)-2(1/3)] [(2^(1/2)-2^(1/4)]........[(2^(1/2)-2^(1/n)]}
n=3
判歛散?
謝謝!!
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1F：推 midarmyman:divergent. by n-th test 114.41.228.237 06/30 00:05
2F：推 midarmyman:不然也可以 原式>sigma(2^(1/2)-1)^( 114.41.228.237 06/30 00:11
3F：→ midarmyman:n-2) n from 0 to infinity 114.41.228.237 06/30 00:12
4F：推 CDnow:可是我用ratio test是<1 convergent 114.25.2.136 06/30 00:13
5F：→ owlran:樓上算出來是根號2-1嘛 .. 114.45.212.234 06/30 00:23
6F：推 CDnow:嗯 114.25.2.136 06/30 00:43
7F：推 lovekwen:本題convergent 用ratio test最明顯 140.113.94.119 06/30 09:03
8F：推 midarmyman:應該收斂財對 我根號二減一看錯 114.41.247.65 06/30 13:29