\documentclass{article}

\usepackage{arydshln}

\begin{document}
\[
\left(\begin{array}{cccccc}
a_{11} & a_{12} & a_{13} & 1 & 0 & 0\\ 
a_{21} & a_{22} & a_{23} & 0 & 1 & 0\\
a_{31} & a_{32} & a_{33} & 0 & 0 & 1
\end{array}\right)
\]

\end{document}
