latex常用符号及模板

\le 
\ge 
\in 
\mathbb{M} 
a \qquad b 
\ne 
\forall 
\exists
\left \lfloor  \right \rfloor 
\nmid
\varnothing

\[\begin{aligned} \le \\ \ge \\ \in \\ \mathbb{M} \\ a \qquad b \\ \ne \\ \forall \\ \exists \\ \left \lfloor \right \rfloor \\ \nmid \\ \varnothing \\ \end{aligned} \]

左对齐计算模板

$$
\begin{aligned}
& \\
& = \\
& = \\
\end{aligned}


\begin{aligned}
& \qquad\text{get}(l_1,r_1,x)\times \text{get}(l_2,r_2,x)\\
& = (g(r_1,x)-g(l_1-1,x))\times (g(r_2,x)-g(l_2-1,x))\\
& = g(r1,x)\times g(r_2,x)-g(r_1,x)\times g(l_2-1,x)-g(l_1-1,x)\times g(r_2,x)+g(l_1-1,x)\times g(l_2-1,x)
\end{aligned}
$$

\[\begin{aligned} & \qquad\text{get}(l_1,r_1,x)\times \text{get}(l_2,r_2,x)\\ & = (g(r_1,x)-g(l_1-1,x))\times (g(r_2,x)-g(l_2-1,x))\\ & = g(r1,x)\times g(r_2,x)-g(r_1,x)\times g(l_2-1,x)-g(l_1-1,x)\times g(r_2,x)+g(l_1-1,x)\times g(l_2-1,x) \end{aligned} \]