Posted by haifeng on 2014-09-23 19:29:34 last update 2014-09-23 19:29:51 | Answers (1) | 收藏
求极限
\[ \lim_{x\rightarrow 0}\frac{(1+mx)^n-(1+nx)^m}{x^2}, \]
这里 $m,n$ 是正整数.
