问题

Questions in category: 级数 (Infinite Series).

设 $a_1=\frac{1}{2}$, $2na_{n+1}=(n+1)a_n$, 记 $S_n=\sum_{k=1}^{n}a_k$, 求 $S_n$.

Posted by haifeng on 2023-07-05 14:26:23 last update 2023-07-05 14:26:23 | Answers (2) | 收藏

设 $a_1=\frac{1}{2}$, $2na_{n+1}=(n+1)a_n$, 记 $S_n=\sum_{k=1}^{n}a_k$, 求 $S_n$.