\begin{exercice}
  \'Ecrire le plus simplement possible. 
  
  \begin{colenumerate}{2}
   \item $\vv{BD}+\vv{DA}$
   \item $\vv{BD}+\vv{AA}$
   \item $\vv{BD}+\vv{DB}$
   \item $\vv{BD}-\vv{BA}$
   \item $\vv{BD}+\vv{AD}+\vv{BA}$
   \item $\vv{BD}-\vv{BA}+\vv{DA}-\vv{DB}$
  \end{colenumerate}

 \end{exercice}
