\begin{exercice}
Même consigne qu'à l'exercice \RefExercice{2G3_E_ex34}.
\begin{colenumerate}{3}
 \item $\vv{BC}-\vv{CD}$
 \item $\vv{BA}-\vv{BC}$
 \item $\vv{DA}-\vv{AB}$
\end{colenumerate} 
\begin{center}
   \begin{tikzpicture}[general, scale=0.8]
\quadrillageSeyes{(0,0)}{(8,3.2)}
\foreach \x/\y/\N/\pos in {5.6/0.8/A/below,7.2/2.4/B/left,1.6/1.6/C/below,3.2/0.8/D/below}
{\pointGraphique{\x}{\y}{\N}{\pos}}
\end{tikzpicture}
\end{center}
\end{exercice}
   