xem ảnh đi đâu?
[latexpage]
\begin{tikzpicture}
\tkzTabInit[nocadre,lgt=1,espcl=2.5]
{$x$/0.7,$y’$/0.7,$y$/2}{$-\infty$,$-2$,$+\infty$}
\tkzTabLine{,-,d,-,}
\tkzTabVar{+/$1$,-D+/$-\infty$/$+\infty$,-/$1$}
\end{tikzpicture}
xem ảnh đi đâu?
[latexpage]
\begin{tikzpicture}
\tkzTabInit[nocadre,lgt=1,espcl=2.5]
{$x$/0.7,$y’$/0.7,$y$/2}{$-\infty$,$-2$,$+\infty$}
\tkzTabLine{,-,d,-,}
\tkzTabVar{+/$1$,-D+/$-\infty$/$+\infty$,-/$1$}
\end{tikzpicture}