%@Dif:3 \definecolor{LightGray}{gray}{0.9} \definecolor{LightGreen}{rgb}{0.5,1,0.5} \definecolor{LightRed}{rgb}{1,0.5,0.5} \definecolor{LightBlue}{rgb}{0.5,0.5,1} \definecolor{LightOrange}{rgb}{1,0.7,0} Voici plusieurs schémas de calculs. Effectue ces calculs. \begin{center} \psset{levelsep=1.5cm,treesep=5mm,arrows=<-,arrowsize=0.2} \pstree[treemode=U]{\Tr{$D=$}}{ \pstree{\Tr{\pscirclebox[fillstyle=solid,fillcolor=LightOrange]{$-$}}}{ \pstree{\Tr{\psshadowbox[fillstyle=solid,fillcolor=LightBlue]{\begin{tabular}{c}\phantom{bonj}\end{tabular}}}}{ \pstree{\Tr{\pscirclebox[fillstyle=solid,fillcolor=LightOrange]{$\times$}}}{ \Tr{\psshadowbox[fillstyle=solid,fillcolor=LightGreen]{\begin{tabular}{c}\hfq$\dfrac12$\hfq\end{tabular}}}\Tr{\psshadowbox[fillstyle=solid,fillcolor=LightGreen]{\begin{tabular}{c}\hfq$\dfrac35$\hfq\end{tabular}}} } } \pstree{\Tr{\psshadowbox[fillstyle=solid,fillcolor=LightBlue]{\begin{tabular}{c}\phantom{bonj}\end{tabular}}}}{ \pstree{\Tr{\pscirclebox[fillstyle=solid,fillcolor=LightOrange]{$\times$}}}{ \Tr{\psshadowbox[fillstyle=solid,fillcolor=LightGreen]{\begin{tabular}{c}\hfq$\dfrac14$\hfq\end{tabular}}}\Tr{\psshadowbox[fillstyle=solid,fillcolor=LightGreen]{\begin{tabular}{c}\hfq$\dfrac53$\hfq\end{tabular}}} } } } } \hfill \pstree[treemode=U]{\Tr{$E=$}}{ \pstree{\Tr{\pscirclebox[fillstyle=solid,fillcolor=LightOrange]{$\times$}}}{ \pstree{\Tr{\psshadowbox[fillstyle=solid,fillcolor=LightBlue]{\begin{tabular}{c}\phantom{bonj}\end{tabular}}}}{ \pstree{\Tr{\pscirclebox[fillstyle=solid,fillcolor=LightOrange]{$+$}}}{ \Tr{\psshadowbox[fillstyle=solid,fillcolor=LightGreen]{\begin{tabular}{c}\hfq$\dfrac12$\hfq\end{tabular}}}\Tr{\psshadowbox[fillstyle=solid,fillcolor=LightGreen]{\begin{tabular}{c}\hfq$\dfrac35$\hfq\end{tabular}}} } } \pstree{\Tr{\psshadowbox[fillstyle=solid,fillcolor=LightBlue]{\begin{tabular}{c}\phantom{bonj}\end{tabular}}}}{ \pstree{\Tr{\pscirclebox[fillstyle=solid,fillcolor=LightOrange]{$+$}}}{ \Tr{\psshadowbox[fillstyle=solid,fillcolor=LightGreen]{\begin{tabular}{c}\hfq$\dfrac14$\hfq\end{tabular}}}\Tr{\psshadowbox[fillstyle=solid,fillcolor=LightGreen]{\begin{tabular}{c}\hfq$\dfrac53$\hfq\end{tabular}}} } } } } \end{center}