数学公式¶ 基础¶ 加减乘除¶ \[ \begin{align} 1 + 2 = 3 \\ 3 - 1 = 2 \\ 2 \times 3 = 6 \\ 6 \div 3 = 2 \end{align} \] 1 2 3 4 5 6 7 8$$ \begin{align} 1 + 2 = 3 \\ 3 - 1 = 2 \\ 2 \times 3 = 6 \\ 6 \div 3 = 2 \end{align} $$