%% 
%%  Example 03-02-9 
%%  Copyright (C) 2016 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{134.31393pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands

%StopShownPreambleCommands
\begin{document}
\large
$A:\frac{B}{C}:D$\\[5pt]
$A\mathopen:\frac{B}{C}\mathclose: D $
\end{document}
