Hướng dẫn gõ công thức Toán trên diễn đàn

$\dfrac{x+2007}{x+2008}$

$\dfrac{x+2007}{x+2008}$

$a_i$

$a^n$

$a^n_i$

$a^{2007}$

$a_{20072008}$

$a^{2007}_{2008}$

$a_{1}^n+a_2^{n+1}+a_{3}^{n+2}+...+a_{n+1}^{2n}$

$\sqrt{a}$

$\sqrt{2007}$

$\sqrt[n]{A}$

$\sqrt[2007]{a}$

$a^n$

$a^{2007}$

$\sqrt[2007]{a^{2008}}$

$\sum_{i=1}^k a_i^n $

$\prod_{i=1}^{n} a_u^k$

$\int\limits_{a}^{b}{f\left(x\right)dx}$

$\perp $

$\parallel $

$\widehat{ABC} $

\[ \begin{cases} f(x)=0 \\ g(x)=0 \end{cases} \]

\[ \left\{ \begin{array} x^2 + y^2 + z^2 = 3  \\
xy + yz + zx = 3  \\
xyz = 1
\end{array} \right.
...................
\left[ \begin{matrix} x^2 + y^2 + z^2 = 3  \\
xy + yz + zx = 3  \\
xyz = 1
\end{matrix} \right.\]

 \begin{cases} x + y = 1 \\ x + y = 2 \end{cases}

  \begin{cases} x + y = 1 \\x + y = 2 \\x + y = 3\end{cases}

Abcdef $ x=1 $ ghijk

Abcdef \( x=1 \) ghijk

Abcdef $$ x=1 $$ ghijk

Abcdef \[ x=1 \] ghijk

Abcdef $ x=1 $ ghijk

Abcdef \( x=1 \) ghijk

Abcdef$$x=1$$ghijk

Abcdef $ x=1 $ ghijk