%% 
%%  Example 07-04-3 
%%  Copyright (C) 2017 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{328.62788pt}
\setlength\parindent{0pt}
\usepackage[T1]{fontenc}
%StartShownPreambleCommands
\usepackage{amsmath}
%StopShownPreambleCommands
\begin{document}
\[
\left(
\begin{array}{c@{}c@{}c}
\begin{array}{|cc|}\hline
a_{11} & a_{12} \\ a_{21} & a_{22} \\\hline
\end{array} & 0 & 0 \\
0 & \begin{array}{|ccc|}
    \hline
    b_{11} & b_{12} & b_{13}\\ b_{21} & b_{22} & b_{23}\\  b_{31} & b_{32} & b_{33}\\ \hline
    \end{array} & 0 \\
0 & 0 & \begin{array}{|cc|}\hline
        c_{11} & c_{12} \\
        c_{21} & c_{22} \\ \hline
        \end{array} \\
\end{array}
\right)
\]
\end{document}
