\setlength{\TabTitreL}{1cm}
\begin{MonTableau}{2}{6.95}{1.2}
\TabNewCol{0}
\rTabPut{B}{-0.5}{0.25}{$x$}
\rTabPut{B}{-0.5}{0.25}{\TabTitre{sgn.}{g'(x)}}
\rTabPut{B}{-0.5}{0.25}{\TabTitre{var.}{g}}
\TabNewCol{0}
\rTabPut{Bl}{0.1}{0.25}{$-\infty$}
\rTabPut{Bl}{0.1}{0.7}{}
\rTabPut{Bl}{0.1}{0.7}{$+\infty$}
\TabNewCol{0.25}
\rTabPut{B}{0}{0.25}{$-\frac{1}{2}$}
\rTabPut{B}{0}{.4}{$0$}
\rTabPut{B}{0}{.5}{$\frac{27}{4}$}
\TabNewCol{.5}
\rTabPut{Br}{-.1}{0.25}{}
\rTabPut{Br}{-.1}{0.25}{}
\rTabPut{Br}{-.1}{0.7}{$+\infty$}
\TabNewCol{.5}
\rTabPut{B}{0}{0.25}{$0$}
\rTabPut[3]{B}{0}{0.25}{}
\rTabPut[3]{B}{0}{0.25}{}
\TabNewCol{.5}
\rTabPut{Bl}{.1}{0.25}{}
\rTabPut{Bl}{.1}{0.25}{}
\rTabPut{Bl}{.1}{0.1}{$-\infty$}
\TabNewCol{0.75}
\rTabPut{B}{0}{0.25}{$1$}
\rTabPut{B}{0}{.4}{$0$}
\rTabPut{B}{0}{.4}{}
\TabNewCol{1}
\rTabPut{Br}{-0.1}{0.25}{$+\infty$}
\rTabPut{Br}{-0.1}{0.7}{}
\rTabPut{Br}{-0.1}{0.7}{$+\infty$}
\TabFleche{B2}{C2}
\TabFleche{C2}{D2}
\TabFleche{F2}{H2}
\rput(.125,.5){$-$}
\rput(.375,.5){$+$}
\rput(.625,.5){$+$}
\rput(.875,.5){$+$}
\rput(.750,1.52){\TabZ}
\end{MonTableau}