Posted by haifeng on 2017-05-30 13:00:28 last update 2017-05-30 13:00:28 | Answers (1) | 收藏
求极限
\[ \lim_{n\rightarrow\infty}\frac{1}{n}(\frac{1}{2}+\frac{2}{2^2}+\frac{3}{2^3}+\cdots+\frac{n}{2^n}) \]
