Tableaux de signes (1 valeurs particulières)

tabs11.jpg

Voici son code :

\begin{variations}
x        & \mI &     &  2 &     &\pI\\
\filet\filet
-4       &     & -~~ & \z & ~~- &   \\
\filet
x-2      &     & -~~ & \z & ~~+ &   \\
\filet\filet
%------------------------------------------------------
-4(x-2)  &     & +~~ & \z & ~~- &   \\
\end{variations}

tabs12.jpg

Voici son code :

\begin{variations}
x                 & ~0  &       &  2 &     &\pI\\
\filet\filet
-4                & \bg & ~~-~~ & \l & ~~- &   \\
\filet
x                 & \bg &   +   & \l & ~~+ &   \\
\filet
x-2               & \bg &   -   & \z & ~~+ &   \\
\filet\filet
%------------------------------------------------------
\frac{-4}{x(x-2)} & \bg &   +   & \z & ~~- &   \\
\end{variations}