推 cometic :∞ 12/18 23:53
→ subtropical :我也覺得是發散，因為他是n^(1/n)*(n^n)^(1/n) 12/18 23:57
→ subtropical :而兩個數列都發散 12/18 23:58
→ subtropical :但是這題是附在一題證明底下 12/18 23:58
→ subtropical :lim an/bn conv, prove sum an conv <=> sum bn conv 12/18 23:59
→ subtropical :所以不知道要怎麼用這個證明來解這題... 12/19 00:00
推 cometic :(1/(n^(n+1)))^(1/n) / (1/n)---->1 as n-->∞ 12/19 00:05
→ subtropical :所以真的是發散...@@ 那根an/bn就沒有關係了@@ 12/19 03:45
→ suhorng :你那敘述不對 還要加上極限值非0 12/19 07:48
推 t0444564 :極限比值審歛法 12/19 11:42