数学

despotism

$\Sigma$

$\eta$

$\sum$

$\color{green}\Huge{\int_a^b}$

$x_{1,2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

$\color{red}\Huge{\xi}$

$\color{blue}\huge{\varphi}$

$\color{green}\Huge{祝明天参加数竞的大佬们超常发挥!}$

$\color(red)\Huge(祝大佬们考的全会，蒙的全对！)$

$$\boxed{\frac{(n+2)!-2}{2}}$$

$/color{green}\{\Man}$