Posted by haifeng on 2016-08-19 00:13:59 last update 2016-08-20 09:08:56 | Answers (1) | 收藏
用 Lagrange 中值定理证明
\[ \frac{1}{x+1} < \ln(x+1)-\ln x <\frac{1}{x}. \]
\[ P_i=\frac{1}{m}\sum_{j=1}^{m}\frac{C_{ij}}{S_i} \]
