\exercice*
{
\psset{nodesepA = -1.5mm, linewidth = 0.6pt, linestyle = dotted, vref = -0.8mm}
\def\virgule{\textcolor{red}{ \LARGE ,}}
Effectuer les conversions suivantes :
\begin{multicols}{2}\noindent
\begin{enumerate}
\item $\unit[86]{dam^3}=\unit[0,086]{hm^3}$\vspace{1ex}\par
\item $\unit[5,6]{dm^3}=\unit[0,000\,005\,6]{dam^3}$\vspace{1ex}\par
\item $\unit[52,9]{cm^3}=\unit[0,000\,052\,9]{m^3}$\vspace{1ex}\par
\item $\unit[35,4]{m^3}=\unit[0,000\,035\,4]{hm^3}$\vspace{1ex}\par
\item $\unit[91,8]{dm^3}=\unit[91\,800\,000]{mm^3}$\vspace{1ex}\par
\item $\unit[37,9]{cm^3}=\unit[0,037\,9]{dm^3}$\vspace{1ex}\par
\end{enumerate}
\end{multicols}
\begin{tabular}{*{20}{p{3.5mm}|}p{3.5mm}}
 \multicolumn{3}{c|}{$\rm km^3$} & \multicolumn{3}{c|}{$\rm hm^3$} & \multicolumn{3}{c|}{$\rm dam^3$} & \multicolumn{3}{c|}{$\rm m^3$} & \multicolumn{3}{c|}{$\rm dm^3$} & \multicolumn{3}{c|}{$\rm cm^3$} &\multicolumn{3}{c}{$\rm mm^3$}\\ \hline
 & & & & & {\textcolor{red}{0}\Rnode{virg1}{\virgule}}& \textcolor{red}{0}& \textcolor{blue}{8}& \textcolor{blue}{6}\Rnode{virg0}{\ }& & & & & & & & & & & & 
\ncline{->}{virg0}{virg1} \\
 & & & & & & & & {\textcolor{red}{0}\Rnode{virg1}{\virgule}}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{blue}{5}\Rnode{virg0}{\ }& \textcolor{blue}{6}& & & & & 
\ncline{->}{virg0}{virg1} \\
 & & & & & & & & & & & {\textcolor{red}{0}\Rnode{virg1}{\virgule}}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{blue}{5}& \textcolor{blue}{2}\Rnode{virg0}{\ }& \textcolor{blue}{9}& & 
\ncline{->}{virg0}{virg1} \\
 & & & & & {\textcolor{red}{0}\Rnode{virg1}{\virgule}}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{blue}{3}& \textcolor{blue}{5}\Rnode{virg0}{\ }& \textcolor{blue}{4}& & & & & & & & 
\ncline{->}{virg0}{virg1} \\
 & & & & & & & & & & & & & \textcolor{blue}{9}& \textcolor{blue}{1}\Rnode{virg0}{\ }& \textcolor{blue}{8}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{red}{0}& \textcolor{red}{0}& {\textcolor{red}{0}\Rnode{virg1}{\virgule}}
\ncline{->}{virg0}{virg1} \\
 & & & & & & & & & & & & & & {\textcolor{red}{0}\Rnode{virg1}{\virgule}}& \textcolor{red}{0}& \textcolor{blue}{3}& \textcolor{blue}{7}\Rnode{virg0}{\ }& \textcolor{blue}{9}& & 
\ncline{->}{virg0}{virg1} \\
\end{tabular}
}