設 a_n -> 5 as n -> oo
b_n -> 3 as n -> oo
Sigma(k from 1 to n-1) k(a_k)(b_(n-k))
求 lim ----------------------------------------
n->oo n^2
就是 (a_1)(b_n-1) + 2(a_2)(b_n-2) + ... + (n-1)(a_n-1)(b_1)
------------------------------------------------------
n^2
趨近於多少當 n 趨近於無窮大
--
--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 114.39.96.166
※ 文章網址: https://www.ptt.cc/bbs/Math/M.1421682269.A.39A.html