在 Markdown 文档中使用 LaTeX 输入公式

$x=0$

$$
x=0
$$

$x^{y^z}=(1+e^x)^{-2xy^w}$

$x_1=x_2+2$

$\underset{6}\bigotimes$

$\frac{a}{b}\quad\dfrac{a}{b}\quad {a\over b}$

$\langle\quad\rangle\quad\lceil\quad\rceil\quad\lfloor\quad\rfloor\quad\lbrace\quad\rbrace\quad\lVert\quad\rVert$
$f(x,y,z)=3y^2z\left(3+\dfrac{7x+5}{1+y^2}\right)$
$\left.\dfrac{\mathrm{d}u}{\mathrm{d}x}\right|_{x=0}$

$$
f\left(
\left[
\dfrac{1+\{x,y\}}{\left(\dfrac{x}{y}+\dfrac{y}{x}\right)(u+1)}+a
\right]
^{\dfrac{3}{2}}
\right)
\tag{行标}
$$

$$
\left\langle q\middle\|\dfrac{\dfrac{x}{y}}{\dfrac{u}{v}}\middle|p\right\rangle
$$

$\sqrt{2}\quad\sqrt[3]{2}$

$\cdots\quad\ldots\quad\vdots\quad\ddots$

$
\overrightarrow{E(\vec{r})}
\overleftarrow{E(\vec{r})}
\overleftrightarrow{E(\vec{r})}
\underrightarrow{E(\vec{r})}
\underleftarrow{E(\vec{r})}
\underleftrightarrow{E(\vec{r})}
\overline{v}=\bar{v}
\underline{v}
$

$$
\iint\limits_D\left(\dfrac{\partial Q}{\partial x}-\dfrac{\partial P}{\partial y}\right){\rm d}x{\rm d}y=\oint\limits_LP{\rm d}x+Q{\rm d}y
$$

$\lim\limits_{n\to\infty}(1+\dfrac{1}{n})^n=e$

$
\sum\limits_{i=1}^n\dfrac{1}{n^2}
\prod\limits_{i=1}^n\dfrac{1}{n^2}
\bigcup\limits_{i=1}^n\dfrac{1}{n^2}
\bigcap\limits_{i=1}^n\dfrac{1}{n^2}
$

$$
\begin{matrix}
1&x&x^2\\
1&y&y^2\\
1&z&z^2\\
\end{matrix}
$$

$$
\left[
\begin{array}{cc|c}
1&2&3\\
4&5&6
\end{array}
\right]
$$

$$
\begin{align}
\sqrt{37} &= \sqrt{\dfrac{73^2-1}{12^2}} \\
&= \sqrt{\dfrac{73^2}{12^2}\cdot\dfrac{73^2-1}{73^2}} \\
&= \sqrt{\dfrac{73^2}{12^2}}\sqrt{\dfrac{73^2-1}{73^2}} \\
&= \dfrac{73}{12}\sqrt{1-\dfrac{1}{73^2}} \\
&\approx \dfrac{73}{12}\left(1-\dfrac{1}{2\cdot73^2}\right) \label{A}
\end{align}
$$

***

$$
\begin{align*}
v+m&=0&\text{Given}\tag1\\
-w&=-w+0&\text{additive identity}\tag2\\
-w+0&=-w+(v+w)&\text{equations $(1)$ and $(2)$}
\end{align*}
$$

$$
f(n)=
\begin{cases}
n/2,&\text{if $n$ is even}\\
3n+1,&\text{if $n$ is odd}
\end{cases}
$$

$$
f(n)=
\begin{cases}
\dfrac n2,&\text{if $n$ is even}\\[2ex]
3n+1,&\text{if $n$ is odd}
\end{cases}\tag{适配[2ex]}
$$
***

$$
f(n)=
\begin{cases}
\dfrac n2,&\text{if $n$ is even}\\
3n+1,&\text{if $n$ is odd}
\end{cases}\tag{不适配[2ex]}
$$

$$
\begin{array}{c|lcr}
n&\text{left}&\text{center}&\text{right}\\
\hline
1&0.24&1&125\\
2&-1&189&-8\\
3&-20&2000&1+10i
\end{array}
$$

$\text{文字 abcd}abcd1234$

${\LARGE A}{\Large A}{\large A}A{\small A}$

$\color{颜色}{文字}$

$\color{#rgb}{文字}$    (注：其中 r、g、b 可以输入 0~9 和 a~f 来分别表示红色、绿色和蓝色的纯度)

$$
\require{cancel}\begin{array}{r1}
\verb|y+\cancel{x}|&y+\cancel{x}\\
\verb|y+\cancel{y+x}|&y+\cancel{y+x}\\
\verb|y+\bcancel{x}|&y+\bcancel{x}\\
\verb|y+\xcancel{x}|&y+\xcancel{x}\\
\verb|y+\cancelto{0}{x}|&y+\cancelto{0}{x}\\
\verb+\frac{1\cancel9}{\cancel95}=\frac15+&\frac{1\cancel9}{\cancel95}=\frac15\\
\end{array}
$$

$$
\require{enclose}\begin{array}{r1}
\verb|\enclose{horizontalstrike}{x+y}|&\enclose{horizontalstrike}{x+y}\\
\verb|\enclose{verticalstrike}{\frac xy}|&\enclose{verticalstrike}{\frac xy}\\
\verb|\enclose{updiagonalstrike}{x+y}|&\enclose{updiagonalstrike}{x+y}\\
\verb|\enclose{downdiagonalstrike}{x+y}|&\enclose{downdiagonalstrike}{x+y}\\
\verb|\enclose{horizontalstrike,updiagonalstrike}{x+y}|&\enclose{horizontalstrike,updiagonalstrike}{x+y}\\
\end{array}
$$