面板图 2x2！

Question

如何用投影仪投影出 4 个图形（2 x 2）的面板。如下例所示：

Answer 1

改进此代码：

  \documentclass{beamer}
  \usetheme{default}

 \begin{document}
 \begin{frame}{Panel figure 2 x 2!}
   \begin{minipage}{1\textwidth}
    \includegraphics[scale = 0.3]{example-image}
    \hfill
    \includegraphics[scale = 0.3]{example-image}
    \vspace{0.5cm}
    \includegraphics[scale = 0.3]{example-image}
    \hfill
    \includegraphics[scale = 0.3]{example-image}
  \end{minipage}

    Figure 1: \ldots
 \end{frame}

 \end{document}