\sectionnn{Repères non orthogonaux}

\exercice[style=A,N=1,verif]{Lire des coordonnées}

Nous avons placé dans e repère $(O;I,J)$ suivant des points. Donner leurs coordonnées.

\begin{center}
\begin{tikzpicture}[>=latex,xslant=0.4,yslant=0.2,scale=0.75]
\draw[gray!50,dashed] (-5,-5) grid (5,5);
\draw[thick,->] (-5,0) -- (5,0);
\draw[thick,->] (0,-5) -- (0,5);
\draw[red,very thick] (0,0) node[below left] {$O$} -- (1,0) node[below] {$I$};
\draw[red,very thick] (0,0) -- (0,1) node[left] {$J$};
\fill[purple] (3,-1) circle (1pt) node[below right] {A};
\fill[purple] (-4,-3) circle (1pt) node[below right] {B};
\fill[purple] (-1,4) circle (1pt) node[below left] {C};
\fill[purple] (-2,-1) circle (1pt) node[below right] {D};
\fill[purple] (2,3) circle (1pt) node[above right] {E};
\end{tikzpicture}
\end{center}