代碼	結(jié)果
a+b
x_i
x_1^2
x_{22}
x^{(n)}
^*x^*
x_{abcd}^{efgh}
\frac{x+y}{2}
\frac{1}{1+\frac{1}{2}}
\sqrt[3]{3}
\sqrt[3]{1+\sqrt[3]{3}}
\sum_{k=1}^{n} \frac{1}{1+k}
\int_{a}^ \frac{1}{1+x} dx
\int_{a}^ f(x)dx
a\!b
ab
a\,b
a\;b
a\ b
a\quad b
a\qquad b
\int_a^b f(x) \, dx
()
[]
\{ \}
|
\left( \sum_{i=1}^n \frac{x^2}{1-x} \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{vmatrix} 1&2 \\\\ 3&4 \end{vmatrix}
\begin{Vmatrix} 1&2 \\\\ 3&4 \end{Vmatrix}
\mathbf{I}
\mathbb{I}
I
\mbox{what}
\begin{aligned} x = {}& a+b+c+{} \\\\ &d+e+f+g \end{aligned}
\begin{aligned} x = a+b+c+{} \\\\ &&&&&d+e+f+g \end{aligned}
\alpha
{alpha}

|

\mathbf{X} = \left( \begin{matrix}
x\_11 & x\_12 & \ldots \\\\
x\_21 & x\_22 & \ldots \\\\
\vdots & \vdots & \ddots
\end{matrix}  \right)

\mathbf{X} = \left( \begin{array}{ccc}
x_{11} & x_{12} & \ldots \\\\
x_{21} & x_{22} & \ldots \\\\
\vdots & \vdots & \ddots
\end{array}
\right)

\begin{gathered}
a=b+c+d \\\\
x=y+z
\end{gathered}

\begin{aligned}
a&=b+c+d \\\\
x&=y+z
\end{aligned}

y=\begin{cases}
-x, \quad x \leq 0 \\\\
x, \quad x > 0
\end{cases}

\left(
\begin{array}{|c|c|}
1&2 \\\\
\hline 
3&4
\end{array}
\right)

\begin{array}{|c|c|}
\hline
1&2 \\\\
\hline
3&4 \\\\
\hline
\end{array}