答案1
我确信我输入了一些错误,但初步估计你可以这样做
\documentclass{article}
\usepackage{booktabs}
\begin{document}
\begin{tabular}{c}
\toprule
$\begin{array}{|c|cc|cc|}
\hline
C_2 & E & C_2 & E & C_2\\
\hline
A & 1 & 1 & 1 &1 \\
B & 1 & 1 & 1 &1 \\
\hline
A & 1 & 1 & 1 &1 \\
B & 1 & 1 & 1 &1 \\
\hline
\end{array}
~\times~
\begin{array}{|c|cc|}
\hline
C_s & E & \sigma\\
\hline
A' & 1 & 1\\
A'' & 1 & -1\\
\hline
\end{array}
~=~
\begin{array}{|c|cc|cc|}
\hline
C_{2\nu} & E & C_2 & \sigma & \sigma_\nu'\\
\hline
A_1 & 1 & 1 & 1 &1 \\
B_1 & 1 & 1 & 1 &1 \\
\hline
A_2 & 1 & 1 & 1 &1 \\
B_2 & 1 & 1 & 1 &1 \\
\hline
\end{array}
$\\
\bottomrule
\end{tabular}
\end{document}