行内插入(a + b)
另取一行a+b

x_1

x_1^2

x^2_1

x_{22}^{(n)}

{}^x^

x_{balabala}^{bala}

\frac{x+y}{2}

\frac{1}{1+\frac{1}{2}}

\sqrt{2}<\sqrt[3]{3}

\sqrt{1+\sqrt[p]{1+a^2}}

\sqrt{1+\sqrt[^p!]{1+a^2}}

\sum_{k=1}^{n}\frac{1}{k}

$\sum_{k=1}^n\frac{1}{k}$

\int_a^b f(x)dx

$\int_a^b f(x)dx$

紧贴 $a!b$
没有空格 $ab$
小空格 a\,b
中等空格 a\;b
大空格 a\ b
quad空格 $a\quad b$
两个quad空格 $a\qquad b$

\left(\sum_{k=\frac{1}{2}}^{N^2}\frac{1}{k}\right)

( ( )
( ) )
( [ )
( ] )
( { )
( } )
( | )
( | )

\begin{matrix}1 & 2\\3 &4\end{matrix}

\begin{pmatrix}1 & 2\\3 &4\end{pmatrix}

\begin{bmatrix}1 & 2\\3 &4\end{bmatrix}

\begin{Bmatrix}1 & 2\\3 &4\end{Bmatrix}

\begin{vmatrix}1 & 2\\3 &4\end{vmatrix}

\left|\begin{matrix}1 & 2\\3 &4\end{matrix}\right|

\begin{Vmatrix}1 & 2\\3 &4\end{Vmatrix}

## 制表

\begin{array}{|c|c|}
\hline
{1111111111} & 2 \\
\hline
3 & 4 \\
\hline
\end{array}

## 希腊字母

\begin{array}{|c|c|c|c|c|c|c|c|}
\hline
{\alpha} & {\backslash alpha} & {\theta} & {\backslash theta} & {o} & {o} & {\upsilon} & {\backslash upsilon} \\
\hline
{\beta} & {\backslash beta} & {\vartheta} & {\backslash vartheta} & {\pi} & {\backslash pi} & {\phi} & {\backslash phi} \\
\hline
{\gamma} & {\backslash gamma} & {\iota} & {\backslash iota} & {\varpi} & {\backslash varpi} & {\varphi} & {\backslash varphi} \\
\hline
{\delta} & {\backslash delta} & {\kappa} & {\backslash kappa} & {\rho} & {\backslash rho} & {\chi} & {\backslash chi} \\
\hline
{\epsilon} & {\backslash epsilon} & {\lambda} & {\backslash lambda} & {\varrho} & {\backslash varrho} & {\psi} & {\backslash psi} \\
\hline
{\varepsilon} & {\backslash varepsilon} & {\mu} & {\backslash mu} & {\sigma} & {\backslash sigma} & {\omega} & {\backslash omega} \\
\hline
{\zeta} & {\backslash zeta} & {\nu} & {\backslash nu} & {\varsigma} & {\backslash varsigma} & {} & {} \\
\hline
{\eta} & {\backslash eta} & {\xi} & {\backslash xi} & {\tau} & {\backslash tau} & {} & {} \\
\hline
{\Gamma} & {\backslash Gamma} & {\Lambda} & {\backslash Lambda} & {\Sigma} & {\backslash Sigma} & {\Psi} & {\backslash Psi} \\
\hline
{\Delta} & {\backslash Delta} & {\Xi} & {\backslash Xi} & {\Upsilon} & {\backslash Upsilon} & {\Omega} & {\backslash Omega} \\
\hline
{\Omega} & {\backslash Omega} & {\Pi} & {\backslash Pi} & {\Phi} & {\backslash Phi} & {} & {} \\
\hline
\end{array}

资源

表格转换工具：https://tableconvert.com/?import=example