引用数学公式1 \[ \begin{equation} \pi^2=x^2+y \label{eq_lab1} \end{equation} \] Here we cite this equation by \(\eqref{eq_lab1}\) $$ \begin{equation} \pi^2=x^2+y \label{eq_lab1} \end{equation} $$ Here we cite this equation by $\eqref{eq_lab1}$ 设置字体颜色2 some