$\text{更新进度：}95\mathrm{\%}$

写在前面：本文章为质心论坛较为权威的一个版本，大家都可以来参考&借鉴&使用滴。

$\text{制作不易，不喜勿喷}$

$\text{上下标及积分等}$

$\text{上标}$

a^2

${�}^2$

$\text{下标}$

a_2

${�}_2$

$\text{组合}$

a^{1+2} x_{1,2}

${�}^{1+2}{�}_{1,2}$

$\text{结合上下标}$

a^2_2

${�}_2^2$

$\text{前置上下标}$

{}^2_1\!X^3_4

${}_1^2{�}_4^3$

$\text{顶标}$

\overset{1}{X}

$\text{底标}$

\underset{2}{X}

$\text{组合}$

\overset{1}{\underset{2}{X}}

$\text{混合}$

\overset{1}{\underset{2}{{}^3_4 X^5_6}}

$\text{导数点}$

\dot{x} \ddot{x}

$\dot{�}\ddot{�}$

$\text{向量}$

\vec{x} \overleftarrow{AB} \overrightarrow{AB} \widehat{AB}

$\overrightarrow{�}\overleftarrow{��}\overrightarrow{��}\widehat{��}$

$\text{上弧}$

\overset{\frown}{AB}

$\text{上划线}$

\overline{ABC}

$\overline{���}$

$\text{中划线}$

\sout{ABC}

$\sout{���}$

$\text{下划线}$

\underline{ABC}

$\underset{‾}{���}$

$\text{上括号}$

\overbrace{1+2+\cdots +100}

$\overbrace{1+2+\cdots +100}$

\begin{matrix}5050\\\overbrace{1+2+\cdots +100}\end{matrix}

$\begin{array}{c}5050\\ \overbrace{1+2+\cdots +100}\end{array}$

$\text{下括号}$

\underbrace{1+2+\cdots +100}

$\underbrace{1+2+\cdots +100}$

\begin{matrix}\underbrace{1+2+\cdots +100}\\5050\end{matrix}

$\begin{array}{c}\underbrace{1+2+\cdots +100}\\ 5050\end{array}$

$\text{求和}$

\sum_{i=1}^na_i \sum\limits_{i=1}^na_i

${\sum }_{�=1}^{�}{�}_{�}{\sum }_{�=1}^{�}{�}_{�}$

$\text{求积}$

\prod_{i=1}^na_i \prod\limits_{i=1}na_i

${\prod }_{�=1}^{�}{�}_{�}\prod _{�=1}�{�}_{�}$

$\text{上积}$

\coprod_{i=1}^na_i \coprod\limits_{i=1}na_i

${\coprod }_{�=1}^{�}{�}_{�}\coprod _{�=1}�{�}_{�}$

$\text{极限}$

\lim_{n\to\infty}x_n \lim\limits_{n\to\infty}x_n

${\lim }_{�\to \mathrm{\infty }}{�}_{�}\underset{�\to \mathrm{\infty }}{\lim }{�}_{�}$

$\text{积分}$

\int \iint \iiint \oint \oiint \oiiint

$\int \iint \iiint \oint ∯∰$

$\text{分数、矩阵等}$

$\text{分数}$

\frac{1}{2}

$\frac{1}{2}$

$\text{小型分数}$

\tfrac{1}{2}

$\frac{1}{2}$

$\text{大型分数}$

\dfrac{1}{2}

${\displaystyle \frac{1}{2}}$

$\text{二次项系数}$

\dbinom{n}{m}

$\left({\displaystyle \genfrac{}{}{0px}{}{�}{�}}\right)$

\binom{n}{m}

$\left(\genfrac{}{}{0px}{}{�}{�}\right)$

\tbinom{n}{m}

$\left(\genfrac{}{}{0px}{}{�}{�}\right)$

$\text{条件定义}$

f(x)=\begin{cases}x-1~~~x\leqslant 3\\x^2+3x-1~~~x＞3\end{cases}

$�(�)=\{\begin{array}{l}�-1�⩽3\\ {�}^2+3�-1�\text{＞}3\end{array}$

$\text{方程组}$

\begin{cases}x+y=3\\x-y=1\end{cases}

$\{\begin{array}{l}�+�=3\\ �-�=1\end{array}$

$\text{多行等式}$

\begin{aligned}f(x)~~~=(x+1)^2\\~~~=x^2+2x+1\end{aligned}

$\begin{array}{r}{\displaystyle �(�)=(�+1{)}^2}\\ {\displaystyle ={�}^2+2�+1}\end{array}$

$\text{表格}$

\begin{array}{|c|c|c|}1&2&3\\4&5&6\\7&8&9\end{array}

$\overline{)\begin{array}{ccc}1& 2& 3\\ 4& 5& 6\\ 7& 8& 9\end{array}}$

$\text{字体}$

$\text{希腊字母}$

\alpha\beta\gamma\delta\epsilon\zeta\eta\theta\iota\kappa\lambda\mu\nu\xi\omicron\pi

$����������������$

\rho\sigma\tau\upsilon\phi\chi\psi\omega

$��������$

\Alpha\Beta\Gamma\Delta\Epsilon\Zeta\Eta\Theta\Iota\Kappa\Lambda\Mu\Nu\Xi\Omicron\Pi

$\mathrm{A}\mathrm{B}\mathrm{\Gamma }\mathrm{\Delta }\mathrm{E}\mathrm{Z}\mathrm{H}\mathrm{\Theta }\mathrm{I}\mathrm{K}\mathrm{\Lambda }\mathrm{M}\mathrm{N}\mathrm{\Xi }\mathrm{O}\mathrm{\Pi }$

\Rho\Sigma\Tau\Upsilon\Phi\Chi\Psi\Omega

$\mathrm{P}\mathrm{\Sigma }\mathrm{T}\mathrm{{\rm Y}}\mathrm{\Phi }\mathrm{X}\mathrm{\Psi }\mathrm{\Omega }$

\varepsilon\digamma\varkappa\varpi\varrho\varsigma\vartheta\varphi

$�\mathrm{ϝ}\mathrm{\varkappa }�����$

$\text{希伯来符号}$

\aleph\beth\gimel\daleth

$\mathrm{\aleph }\mathrm{\beth }\mathrm{\gimel }\mathrm{\daleth }$

$\text{字体们}$

\mathbb{A}#仅限大写英文字母

$\mathbb{�}$

\mathbf{Aa1}#英文字母大小写和数字

$\mathbf{�}\mathbf{�}\mathbf{1}$

\mathit{Aa1\Alpha}#都适用

$��\mathit{1}\mathrm{A}$

\mathrm{Aa1}#英文字母大小写和数字

$\mathrm{A}\mathrm{a}1$

\mathtt{Aa1\Alpha}#都适用

$\mathtt{�}\mathtt{�}\mathtt{1}\mathrm{A}$

\mathsf{Aa1\Alpha}#都适用

$\mathsf{�}\mathsf{�}\mathsf{1}\mathrm{A}$

\mathcal{A1}#英文大写字母和数字

$\mathcal{�}\mathcal{1}$

\mathfrak{Aa1}#英文字母大小写和数字

$\mathfrak{�}\mathfrak{�}\mathfrak{1}$

\scriptstyle\text{Aa1}#英文字母大小写和数字

$\text{Aa1}$

$\text{混合字体}$

斜体字符

x y z

$���$

非斜体字符

\text{x y z} \text{中文}

$\text{x y z中文}$

混合

\text{if }n\text{ is even}

$\text{if }�\text{ is even}$

$\text{括号}$

$\text{普通括号}$

(\frac{1}{2})#一定要用英文的括号呦

$(\frac{1}{2})$

$\text{和式子大小匹配的括号}$

\left(\frac{1}{2}\right)

$\left(\frac{1}{2}\right)$

$\text{圆括号}$

\left(\frac{1}{2}\right)

$\left(\frac{1}{2}\right)$

$\text{方括号}$

\left[\frac{1}{2}\right]

$\left[\frac{1}{2}\right]$

$\text{花括号}$

\left\{\frac{1}{2}\right\}

$\left\{\frac{1}{2}\right\}$

$\text{角括号}$

\left\langle\frac{1}{2}\right\rangle

$⟨\frac{1}{2}⟩$

$\text{绝对值}$

\left|\frac{1}{2}\right|

$\mid \frac{1}{2}\mid$

$\text{双竖线}$

\left\|\frac{1}{2}\right\|

$\parallel \frac{1}{2}\parallel$

$\text{向上取整}$

\left\lceil\frac{1}{2}\right\rceil

$\lceil \frac{1}{2}\rceil$

$\text{向下取整}$

\left\lfloor\frac{1}{2}\right\rfloor

$\lfloor \frac{1}{2}\rfloor$

$\text{斜线}$

\left/\frac{1}{2}\right/

$/\frac{1}{2}/$

$\text{上下箭头}$

\left\uparrow\frac{1}{2}\right\uparrow

$\uparrow \frac{1}{2}\uparrow$

\left\Downarrow\frac{1}{2}\right\Downarrow

$\Downarrow \frac{1}{2}\Downarrow$

\left\updownarrow\frac{1}{2}\right\updownarrow

$\updownarrow \frac{1}{2}\updownarrow$

$\text{混合括号}$

\left\langle\frac{1}{2}\right/

$⟨\frac{1}{2}/$

\left(\frac{1}{2}\right]

$\left(\frac{1}{2}\right]$

$\text{单左括号}$

\left(\frac{1}{2}\right.

$(\frac{1}{2}$

$\text{单右括号}$

\left.\frac{1}{2}\right)

$\frac{1}{2})$

$\text{强制括号大小}$

\Bigg(\bigg[\Big\{\big\langle x\big\langle\Big\}\bigg]\Bigg)

$\left(\right[\{⟨�⟨\}\left]\right)$

$\text{空格}$

x\!y

$��$

xy

$��$

x\,y

$��$

x\;y

$��$

x\ y

$��$

x\quad y

$��$

x\qquad y

$��$

$\text{颜色们}$

字体颜色：\color{颜色}{文字}

方框：\fcolorbox{边框颜色}{盒子颜色}{\color{字体颜色}{文字}}

$����������$

$�����$

$����$

$����������$

$�����$

$���������$

$��������������$

$����$

$�������ℎ��$

$�����������$

$���ℎ���$

$���������$

$����$

$����$