Beamer 中的方程

Question

我的脚本运行良好，直到我添加带有方程的框架。我的脚本：

\documentclass{beamer}
% Replace the \documentclass declaration above
% with the following two lines to typeset your 
% lecture notes as a handout:
%\documentclass{article}
%\usepackage{beamerarticle}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{amsmath}
\usepackage{amsopn} 



\section{Proposed Solution}
\subsection{ Model}
\begin{frame}{ Model}
\begin{block}{model XX}
     three factors
    \begin{itemize}
        \item 1. 
        \item 2.
        \item 3.
    \end{itemize}
\end{block}

\begin{block}{Formula}
    calculated in this equation
    \begin{equation}

            Total = \frac{1}{n}*\sum_{i=0}^n (eachnode_i) 

    \end{equation}

\end{block}

\end{frame}

Answer 1

• 您有问题的代码不完整：缺少\begin{document}和\end{document}。
• 在方程式（数学环境）中不允许有空行

\documentclass{beamer}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
%\usepackage{amsfonts}  % loaded by amssymb, see Mico comment
%\usepackage{amsopn}    % loaded by amssymb

\begin{document}        % <--- added
\section{Proposed Solution}
\subsection{ Model}
\begin{frame}
\frametitle{Model}
\begin{block}{model XX}
     three factors
    \begin{itemize}
        \item 1.
        \item 2.
        \item 3.
    \end{itemize}
\end{block}

\begin{block}{Formula}
    calculated in this equation
    \begin{equation}    % <--- deleted empty lines
            Total = \frac{1}{n}*\sum_{i=0}^n (eachnode_i)
    \end{equation}
\end{block}
\end{frame}
\end{document}          % <--- added

• 考虑到上述情况，我无法重现您的错误。它适用于xelatex宽度pdflatex：