Code: Select all
\documentclass[12pt,a4paper]{article}
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{pstricks}
\usepackage{pst-tree}
\begin{document}
\pstree[treenodesize=1,nodesep=2pt]{\Tr{-}}
{\pstree{\Tr{$\div$}}
{\Tr{3}
\pstree{\Tr{*}}
{\Tr{9}
\pstree{\Tr{-}}
{\Tr{5}\Tr{2}}}}
\pstree{\Tr{$\div$}}
{\Tr{2}
\pstree{\Tr{*}}
{\Tr{4}
\pstree{\Tr{-}}
{\Tr{6}\Tr{1}}}}}
\end{document}
Any help would be appreciated.
Nick