\(LaTex\)
将数学公式写在$$之间，代表的是插入行内数学公式。
将数学公式写在$$ $$之间，会使公式独立成一行并强制居中。
$\left\vert a\right\vert$
\(\left\vert a\right\vert\)
$\lVert z\rVert$
\(\lVert z\rVert\)
$\infty$
\(\infty\)
$a\equiv b\pmod c$
\(a\equiv b\pmod c\)
$a\bmod b$
\(a\bmod b\)
$\mid \nmid \shortmid \nshortmid$
\(\mid \nmid \shortmid \nshortmid\)
$\sqrt{2} \sqrt[n]{x}$
\(\sqrt{2} \sqrt[n]{x}\)
$\pm \mp \dotplus$
\(\pm \mp \dotplus\)
$\times \div \divideontimes$
\(\times \div \divideontimes\)
$\in \not\in \ni \not\ni$
\(\in \not\in \ni \not\ni\)
$\cap \Cap \sqcap \bigcap$
\(\cap \Cap \sqcap \bigcap\)
$\cup \Cup \sqcup \bigcup \bigsqcup \uplus \biguplus$
\(\cup \Cup \sqcup \bigcup \bigsqcup \uplus \biguplus\)
$\subset \Subset \sqsubset$
\(\subset \Subset \sqsubset\)
$\supset \Supset \sqsupset$
\(\supset \Supset \sqsupset\)
$\subseteq \nsubseteq \subsetneq \varsubsetneq \sqsubseteq$
\(\subseteq \nsubseteq \subsetneq \varsubsetneq \sqsubseteq\)
$\supseteq \nsupseteq \supsetneq \varsupsetneq \sqsupseteq$
\(\supseteq \nsupseteq \supsetneq \varsupsetneq \sqsupseteq\)
$\subseteqq \nsubseteqq \subsetneqq \varsubsetneqq$
\(\subseteqq \nsubseteqq \subsetneqq \varsubsetneqq\)
$\supseteqq \nsupseteqq \supsetneqq \varsupsetneqq$
\(\supseteqq \nsupseteqq \supsetneqq \varsupsetneqq\)
$\ne \neq \equiv \not\equiv$
\(\ne \neq \equiv \not\equiv\)
$\sim \nsim \backsim \thicksim \simeq \backsimeq \eqsim \cong \ncong$
\(\sim \nsim \backsim \thicksim \simeq \backsimeq \eqsim \cong \ncong\)
$\approx \thickapprox \approxeq \asymp \propto \varpropto$
\(\approx \thickapprox \approxeq \asymp \propto \varpropto\)
$\leqslant \geqslant$
\(\leqslant \geqslant\)
$\forall \therefore \because \And$
\(\forall \therefore \because \And\)
$\overline{abc} \underline{abc}$
\(\overline{abc} \underline{abc}\)
$a^2$
\(a^2\)
$a_2$
\(a_2\)
${}^2_1\!X^3_4$
\({}^2_1\!X^3_4\)
$\vec{x} \overleftarrow{AB} \overrightarrow{AB} \widehat{AB}$
\(\vec{x} \overleftarrow{AB} \overrightarrow{AB} \widehat{AB}\)
$\overset{\frown}{AB}$
\(\overset{\frown}{AB}\)
$\overbrace{1+2+\cdots+100}$
\(\overbrace{1+2+\cdots+100}\)
$\begin{matrix}5050\\\overbrace{1+2+\cdots+100}\end{matrix}$
\(\begin{matrix}5050\\\overbrace{1+2+\cdots+100}\end{matrix}\)
$\underbrace{1+2+\cdots+100}$
\(\underbrace{1+2+\cdots+100}\)
$\begin{matrix}\underbrace{1+2+\cdots+100}\\5050\end{matrix}$
\(\begin{matrix}\underbrace{1+2+\cdots+100}\\5050\end{matrix}\)
$\sum_{i=1}^na_i \sum\limits_{i=1}^na_i$
\(\sum_{i=1}^na_i \sum\limits_{i=1}^na_i\)
$\prod_{i=1}^na_i \prod\limits_{i=1}^na_i$
\(\prod_{i=1}^na_i \prod\limits_{i=1}^na_i\)
$\lim_{n\to\infty}a_i \lim\limits_{n\to\infty}a_i$
\(\lim_{n\to\infty}a_i \lim\limits_{n\to\infty}a_i\)
$\int_{-N}^{N}a^x\,dx$
\(\int_{-N}^{N}a^x\,dx\)
$\frac{1}{2}$
\(\frac{1}{2}\)
$\dbinom{n}{m}$
\(\dbinom{n}{m}\)
$\begin{vmatrix}a&b\\c&d\end{vmatrix}$
\(\begin{vmatrix}a&b\\c&d\end{vmatrix}\)
$\begin{bmatrix}a&\cdots&b\\\vdots&\ddots&\vdots\\c&\cdots&d\end{bmatrix}$
\(\begin{bmatrix}a&\cdots&b\\\vdots&\ddots&\vdots\\c&\cdots&d\end{bmatrix}\)
$\begin{Bmatrix}a&c\\b&d\end{Bmatrix}$
\(\begin{Bmatrix}a&c\\b&d\end{Bmatrix}\)
$\begin{pmatrix}a&c\\b&d\end{pmatrix}$
\(\begin{pmatrix}a&c\\b&d\end{pmatrix}\)
\begin{cases}x-1&x\leqslant3\\x^2+3x-1&x>3\end{cases}
\begin{cases}x-1&x\leqslant3\x^2+3x-1&x>3\end{cases}
\begin{cases}2x+9y-5z=10\\4x+20y+z=24\\x-\frac{1}{2}y+3z=8\end{cases}
\begin{cases}2x+9y-5z=10\4x+20y+z=24\x-\frac{1}{2}y+3z=8\end{cases}
$\begin{aligned}f(x)&=(x+1)^2\\&=x^2+2x+1\end{aligned}$
\(\begin{aligned}f(x)&=(x+1)^2\\&=x^2+2x+1\end{aligned}\)
$\begin{aligned}a_1&=1\\a_2&=2\\&\dots\\a_n&=n\end{aligned}$
\(\begin{aligned}a_1&=1\\a_2&=2\\&\dots\\a_n&=n\end{aligned}\)
$\begin{array}{|c|c||c|}x&y&z\\8&2&4\\2&3&9\\10&\frac{3}{4}&\sqrt{3}\\a&b&c\end{array}$
\(\begin{array}{|c|c||c|}x&y&z\\8&2&4\\2&3&9\\10&\frac{3}{4}&\sqrt{3}\\a&b&c\end{array}\)
$\alpha\beta\gamma\delta\epsilon\zeta\eta\theta$
\(\alpha\beta\gamma\delta\epsilon\zeta\eta\theta\)
$\boxed{\sum\limits_{i=1}^{n}i=\frac{n(n-1)}{2}}$
\(\boxed{\sum\limits_{i=1}^{n}i=\frac{n(n-1)}{2}}\)
常用的大概就那么多，其他的自己百度吧。