\documentstyle[rep10,leqno]{report}
\voffset = -1in
\evensidemargin 0.1in
\oddsidemargin 0.1in
\textheight 9in
\textwidth 6in
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%   Add these two lines if you don't have Mma style file
\def\Mvariable{}
\def\NCAmpersand{&}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\normalsize
\baselineskip=12pt
\noindent
$$ 
\pmatrix { \Mvariable{k1} \NCAmpersand \Mvariable{u1} \NCAmpersand
  \Mvariable{k2} \cr \Mvariable{k3} \NCAmpersand \Mvariable{u2} \NCAmpersand
  \Mvariable{k4} \cr \Mvariable{u3} \NCAmpersand \Mvariable{k5} \NCAmpersand
  \Mvariable{u4} \cr }
$$ 
$$ 
\pmatrix { \Mvariable{u5} \NCAmpersand \Mvariable{k6} \NCAmpersand
  \Mvariable{k7} \cr \Mvariable{k8} \NCAmpersand \Mvariable{k9} \NCAmpersand
  \Mvariable{u6} \cr \Mvariable{k10} \NCAmpersand \Mvariable{u7} \NCAmpersand
  \Mvariable{k11} \cr }
$$ 
\end{document}
