Nekor 发表于 2013-1-6 23:24 这个JS最好是在自己站内加载,远程的cdn.mathjax.org 加载速度太长了。使用方法:http://api.gn00.com/MathJax/test/sample.html
When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$
\begin{align} a_{11}& =b_{11}& a_{12}& =b_{12}\notag\\ a_{21}& =b_{21}& a_{22}& =b_{22}+c_{22} \tag{y} \end{align}