示例: 演示代码: 也可参看The package easybmat来实现\[
\left[ {\begin{array}{c:c}
\begin{matrix}
1 & 12 & 3 & 8 \\
14 & 5 & 16 &21\\
7 & 18 & 9 &7 \\
23 & 0 & -1 &8\\
\end{matrix}&
\begin{matrix}
1 & 4 \\
2 & 5 \\
3 & 6 \\
13 & 26 \\
\end{matrix}
\end{array}} \right]
\]
http://www.ctex.org/documents/packages/math/docbmat.pdf
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