%% 
%%  A DANTE-Edition example
%% 
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}

\usepackage{multirow,bigstrut}
\usepackage[table]{xcolor}
\renewcommand\multirowsetup{\centering}

\begin{document}
\begin{tabular}{|l|>{\columncolor{black!30}}r|>{\columncolor{black!20}}r|}\hline
  col1 row1 & col2 row1 & \multirow{3}[6]{1.5cm}{col3} \bigstrut\\\cline{1-1}
  col1 row2 & col2 row2 & \bigstrut                           \\\cline{1-2}
  col1 row3 & \multirow{2}[4]{2cm}[0.8\abovedisplayskip]{\[f(x,y)=x\cdot y\]} &
	                                       \bigstrut\\\cline{1-1}\cline{3-3}
  col1 row4 &        & col3 row4\bigstrut\\\hline
\end{tabular} \quad
\begin{tabular}{|l|>{\columncolor{black!30}}r|>{\columncolor{black!20}}r|}\hline
  col1 row1 & col2 row1 & \bigstrut                        \\\cline{1-1}
  col1 row2 & col2 row2 & \bigstrut                        \\\cline{1-2}
  col1 row3 &  & \multirow{-3}[6]{1.5cm}{col3} \bigstrut  \\\cline{1-1}\cline{3-3}
  col1 row4 &  \multirow{-2}[4]{2cm}[0.8\abovedisplayskip]{\[f(x,y)=x\cdot y\]}
      & col3 row4                              \bigstrut\\\hline
\end{tabular}
\end{document}