$ \frac{a}{b}$
Display type 使用2個美金符號!! 並且置中。
$$ \frac{a}{b}$$
範例
The Lorenz Equations
$$\begin{aligned}
\dot{x} & = \sigma(y-x) \\
\dot{y} & = \rho x - y - xz \\
\dot{z} & = -\beta z + xy
\end{aligned}
$$
A Cross Product Formula
$$\mathbf{V}_1 \times \mathbf{V}_2 = \begin{vmatrix}
\mathbf{i} & \mathbf{j} & \mathbf{k} \\
\frac{\partial X}{\partial u} & \frac{\partial Y}{\partial u} & 0 \\
\frac{\partial X}{\partial v} & \frac{\partial Y}{\partial v} & 0
\end{vmatrix}
$$
版面配置=>新增小工具=> [HTML/Javascript]
標題可打可不打，我是打上MathJax，打的話就會在右上角出現MathJax。
然後把下面指令貼入內容
<script type="text/x-mathjax-config">
MathJax.Hub.Config({tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']],
displayMath: [['\\[','\\]'], ['$$','$$']]}});
blogger.ui().viewType_.prototype.onRenderComplete=function(){MathJax.Hub.Queue(['Typeset',MathJax.Hub])};
</script>
<script type="text/javascript"
src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
</script>
之後只要在要打的數學符號前面加上錢字號即可了囉!!
http://www.mathjax.org/
