Posted by haifeng on 2020-10-29 17:06:07 last update 2022-09-20 20:20:39 | Answers (1) | 收藏
计算
\[1+\frac{1}{1+2}+\frac{1}{1+2+3}+\cdots+\frac{1}{1+2+3+\cdots+n}\]
并求极限
\[ \lim_{n\rightarrow\infty}\biggl(1+\frac{1}{1+2}+\frac{1}{1+2+3}+\cdots+\frac{1}{1+2+3+\cdots+n}\biggr) \]
