Eine Idee wäre das blkarray-Paket.
Code:
\documentclass{report}
\usepackage{amsmath}
\usepackage{blkarray}
\usepackage{multirow}
\usepackage{graphicx}
\begin{document}
\[
\begin{aligned}
\scalebox{1.5}{$A = \quad$} &
\begin{blockarray}{ccccc|ccccc|cccc}
&& \BAmulticolumn{3}{c|}{A_{C, a}} & \BAmulticolumn{5}{c|}{A_{C, b}} & \BAmulticolumn{3}{c}{A_{C, c}} \\
\begin{block}{c(c@{\hspace*{5pt}}ccc|ccccc|ccc@{\hspace*{5pt}}c)}
&& 0 & 1 & 0 & -1 & 0 & 0 & 1 & 0 &-1 & 0 & 0& \\
A_{L, a} && 1 & 0 & 0 & 1 & 2 & 0 & 0 & 0 & 0 & 0 & 0 &\\
&& 0 & 0 & 0 & 0 & 0 & 0 &-1 &-1 & 2 & 0 & 0 &\\ \cline{1-13}
&& 0 & 1 & 0 &-1 &-1 & 1 & 1 & 0 &-1 & 0 & 0 &\\
A_{L, b} && 1 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 &\\
&& 0 & 0 & 0 & 0 & 0 & 0 &-1 &-1 & 0 & 0 & 0 &\\ \cline{1-13}
&& 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 &-1 & 0 & 0 &\\
A_{L, c} && 1 & 0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 &\\
&& 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 &\\
\end{block}
\end{blockarray}
\end{aligned}
\]
\end{document}
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