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就是写公式那个：
\begin{equation} ddd \end{equation}
怎么能简化成类似下种：
\xx ddd \xx
或者
\begin{e} ddd \end{e}
也行
可以用newcommand
\newcommand\xx{\begin{equation}} \newcommand\xxx{\end{equation}}
\xx 1+1=2 \xxx
输出：
@fu 多谢大佬大佬！！
mark 一下
