測試

測試
\(\displaystyle\sum_{n=1}^{\infty}\frac1{n^2} = \frac{\pi^2}{6}\)

\(\displaystyle\sum_{i=1}^{10}x_{i}=70,\sum_{i=1}^{10}y_{i}=50,\sum_{i=1}^{10}x_{i}^{2}=1490,\sum_{i=1}^{10}x_{i}y_{i}=420\)

[ 本帖最後由 james2009 於 2017-5-1 00:45 編輯 ]