 \parbox[b][13em][c]{0.45\linewidth}{Pour les exercices \RefQCM{TSG3_QCM_ps_debut_1} à \RefQCM{TSG3_QCM_ps_fin_2}, on considère le cube $ABCDEFGH$ d'arête 1 ci-contre.\\
 On se place dans le repère orthonormé $\left(A\,; \vv{AB}, \vv{AD}, \vv{AE} \right)$.}
 \parbox[b][13em][t]{0.55\linewidth}{\begin{center}
 	\def \dx {-0.4}
	\begin{tikzpicture}[general, scale=2]
	%points
	\coordinate (A) at (0,0); \draw (A) node[left] {$A$};
	\coordinate (B) at (\dx,-0.5); \draw (B) node[below left] {$B$};
	\coordinate (C) at (1+\dx,-0.5); \draw (C) node[below] {$C$};
	\coordinate (D) at (1,0); \draw (D) node[right] {$D$};
	\coordinate (E) at (0,1); \draw (E) node[above left] {$E$};
	\coordinate (F) at (\dx,0.5); \draw (F) node[left] {$F$};
	\coordinate (G) at (1+\dx,0.5); \draw (G) node[right] {$G$};
	\coordinate (H) at (1,1); \draw (H) node[above right] {$H$};
	%arêtes
	\draw (F)--(B)--(C)--(D)--(H)--(G)--(C); \draw (G)--(F)--(E)--(H);
	\draw[dashed] (A)--(B); \draw[dashed] (A)--(D); \draw[dashed] (A)--(E);
	\end{tikzpicture}
	 \end{center}}


  \begin{exercice} \label{TSG3_QCM_ps_debut_1} Un vecteur normal au plan $(BGE)$ a pour coordonnées :
   \begin{ChoixQCM}{3}
    \item $\begin{pmatrix} -1 \\ 1 \\ -1 \end{pmatrix}$
    \item $\begin{pmatrix} 1 \\ -1 \\ 1 \end{pmatrix}$
    \item $\begin{pmatrix} 1 \\ 1 \\ 0 \end{pmatrix}$
   \end{ChoixQCM}
   \begin{corrige}
    \reponseQCM{ab}
   \end{corrige}
  \end{exercice}
  

