![这个超级简单的公式有什么问题?](https://linux22.com/image/262472/%E8%BF%99%E4%B8%AA%E8%B6%85%E7%BA%A7%E7%AE%80%E5%8D%95%E7%9A%84%E5%85%AC%E5%BC%8F%E6%9C%89%E4%BB%80%E4%B9%88%E9%97%AE%E9%A2%98%EF%BC%9F.png)
也许我累了,无法解决这个简单的问题。这是我的简短回答MWE
\documentclass [11 pt, xcolor=pdftex,x11names,table]{beamer}
\begin{document}
\begin{frame}
\begin{block}{Approximation for expected waiting time}
\[
T_q \approx a \times \frac{u^\sqrt{2(c+1)}}{1-u} \times \frac{CV^2_a+CV^2_p}{2} \]
\end{block}
\end{frame}
\end{document}
当我尝试编译它时,我得到了Missing{inserted \end{frame}
我犯了错误吗?