\begin{exercice}
 Voici le tableau de variations d'une fonction $f$. Choisir la courbe correspondante à ce tableau.
 
 \begin{center}
\begin{tikzpicture}[general, scale=0.8]
\tkzTabInit[lgt=1.3,espcl=3.9, color, colorC=H4, colorV=H4, colorL=H4, colorT=A4, lw=0.3mm]{ $x$ / 1, $f(x)$ / 2}
{ $-2{,}5$ , $1$ , $2{,}5$ }
\tkzTabVar{ -/ $-2$ , +/ $1{,}5$ , -/ $-1$ }
\end{tikzpicture}
\end{center}
 
\begin{tikzpicture}[general, scale=0.78]
 \draw[quadrillage55] (-2.5,-2.5)grid (2.5,2.5);
 \axeX{-2.5}{2.5}{1}
 \axeY{-2.5}{2.5}{1}
 \origine
 \draw[epais, color=C1] plot coordinates{(-2.5,-2)(1,1.5)(2.5,-1)};
 \draw[color=A1, epais] (-2,2) node[draw, circle] {$a$};
\end{tikzpicture}
\hfill
\begin{tikzpicture}[general, scale=0.78]
 \draw[quadrillage55] (-2.5,-2.5)grid (2.5,2.5);
 \axeX{-2.5}{2.5}{1}
 \axeY{-2.5}{2.5}{1}
 \origine
\draw[ epais, color=C1] plot coordinates{(-2,-2.5)(1,1.5)(2.5,-1)};
\draw[color=A1, epais] (-2,2) node[draw, circle] {$b$};
\end{tikzpicture}
\vspace{0.5em}
\begin{tikzpicture}[general, scale=0.78]
 \draw[quadrillage55] (-2.5,-3)grid (2.5,2);
 \axeX{-2.5}{2.5}{1}
 \axeY{-2.5}{2.5}{1}
 \origine
\draw[smooth, epais, color=C1] plot coordinates{(-2.5,-2)(-1,-2.5)(1,1.5)(2.1,-1)};
\draw[color=A1, epais] (-2,1.5) node[draw, circle] {$c$};
\end{tikzpicture}
\hfill
\begin{tikzpicture}[general, scale=0.78]
 \draw[quadrillage55] (-2.5,-2.5)grid (2.5,2.5);
 \axeX{-2.5}{2.5}{1}
 \axeY{-2.5}{2.5}{1}
 \origine
\draw[smooth, epais, color=C1] plot coordinates{(-2.5,-2)(-2,0.5)(-1,-0.5)(1,1.5)(2.5,-1)};
\draw[color=A1, epais] (-2,2) node[draw, circle] {$d$};
\end{tikzpicture}
\end{exercice}
