$\LaTeX$ 是个好东西，但是语法太难记了。这篇文章仅为了记录下 $\LaTeX$ 操作。

$\LaTeX$ is a good thing, but the grammar is too difficult to remember. This article is only for recording $\LaTeX$ operations.

Recommend an online $\LaTeX$ equation website, which can also write chemical equations: https://latexeditor.lagrida.com/

Contents include: fraction, division, multiplication, set, subset, proper subset, belong to, not belong to

ResultLaTeX
$\frac{x+1}{2}$\frac{x+1}{2}
$\pm\mp$\pm\mp
$\cdot\div\times$\cdot\div\times
$\mathbb{R}\mathbb{Q}\mathbb{Z}$\mathbb{R}\mathbb{Q}\mathbb{Z}
$\mathbf{R}\mathbf{Q}\mathbf{Z}$\mathbf{R}\mathbf{Q}\mathbf{Z}
$\subset\supset\notin\in$\subset\supset\notin\in
$\subsetneq\subseteq\subsetneqq\subseteqq$\subsetneq\subseteq\subsetneqq\subseteqq
$\supsetneq\supseteq\supsetneqq\supseteqq$\supsetneq\supseteq\supsetneqq\supseteqq
$\cap\cup\mid$\cap\cup\mid
$\sin\!\frac{pi}{3}$\sin\!\frac{pi}{3}
$\perp\triangle\angle$\perp\triangle\angle

To be continued...

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