1.引入数学包
\usepackage{amsmath}
2.数学公式环境
\begin{equation}
...
\end{equation}
3.排版对齐环境
\begin{aligned}
...
\end{aligned}
例子:
\section{Equation}
\begin{equation}
\begin{aligned}%用&对齐,\\换行
a&=3,b=4\\
c&={a}\times{b}\\
&={3}\times{4}\\
&=12
\end{aligned}
\tag{equ 1}%公式标号
\end{equation}
![](https://img.haomeiwen.com/i8522707/f7ac8e40c1551e1d.png)
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