\begin{exercice*}
  On donne le tableau de variations d'une fonction $u$ définie sur $[-2 \ ; \ 5]$

  \begin{center}
    \begin{tikzpicture}[yscale=0.7,general]
      \tkzTabInit[lgt=1.25,espcl=2, lw=0.3mm, color, colorC=H4,
      colorV=H4, colorL=H4, colorT=A4] {$x$/1,$u(x)$/3} {$0$ , $2$ ,
        $6$} \tkzTabVar{-/$4$ , +/$9$ , -/$1$}
    \end{tikzpicture}
  \end{center}



  On donne ci-dessous les tableaux de variations de quatre fonctions
  $f$, $g$, $h$ et $l$ déduites de $u$. Retrouver parmi les fonctions
  $\sqrt{u}$, $8 \times \dfrac{1}{u}$, $-\dfrac{1}{2}u$ et $u - 6$
  laquelle est $f$, $g$, $h$ ou $l$.

\begin{center}
  \begin{tikzpicture}[yscale=0.7,general]
    \tkzTabInit[lgt=1.25,espcl=2, lw=0.3mm, color, colorC=H4,
    colorV=H4, colorL=H4, colorT=A4]
    {$x$/1,$f(x)$/3}
    {$0$ , $2$ , $6$} 
    \tkzTabVar{+/$-2$ , -/$f(2)$ , +/$f(6)$}
  \end{tikzpicture}

  \vspace{3mm}

  \begin{tikzpicture}[yscale=0.7,general]
    \tkzTabInit[lgt=1.25,espcl=2, lw=0.3mm, color, colorC=H4,
    colorV=H4, colorL=H4, colorT=A4]
    {$x$/1,$g(x)$/3}
    {$0$ , $2$ , $6$} 
    \tkzTabVar{-/$-2$ , +/$g(2)$ , -/$g(6)$}
  \end{tikzpicture}

  \begin{tikzpicture}[yscale=0.7,general]
    \tkzTabInit[lgt=1.25,espcl=2, lw=0.3mm, color, colorC=H4,
    colorV=H4, colorL=H4, colorT=A4]
    {$x$/1,$h(x)$/3}
    {$0$ , $2$ , $6$} 
    \tkzTabVar{-/$2$ , +/$h(2)$ , -/$h(6)$}
  \end{tikzpicture}

  \vspace{3mm}

  \begin{tikzpicture}[yscale=0.7,general]
    \tkzTabInit[lgt=1.25,espcl=2, lw=0.3mm, color, colorC=H4,
    colorV=H4, colorL=H4, colorT=A4]
    {$x$/1,$l(x)$/3}
    {$0$ , $2$ , $6$} 
    \tkzTabVar{+/$2$ , -/$l(2)$ , +/$l(6)$}
  \end{tikzpicture}
\end{center}

\end{exercice*}
\begin{corrige}
  $\sqrt{u} = h$, $8\times \dfrac{1}{u}$, $-\dfrac{1}{2}u = f$ et $u-6
  = g$.
\end{corrige}
