\documentclass[12pt,a4paper]{article}
\usepackage[francais]{babel}
\usepackage{mafr}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{lmodern}
\usepackage[dvipsnames]{xcolor}
\usepackage{pstricks}
\usepackage{pstricks-add}
\begin{document}
{\psset{unit=.75cm,arrowscale=1.7}%
\begin{pspicture*}(-4.5,-3.5)(4.5,8.5)
\pscustom[fillstyle=solid,fillcolor=cyan]{%
	\psplot[algebraic=true]{-1}{2}{x^2-3*x+2}%
	\psplot[algebraic=true]{2}{-1}{-x^2-x+6}%
}%
\psgrid[gridcolor=lightgray,griddots=20,%
        subgriddiv=1,gridlabels=0pt,gridwidth=.4pt]%
       (0,0)(-5.5,-3.5)(4.5,8.5)%
\begin{tiny}%
\psaxes[arrows=->](0,0)(-4.5,-3.5)(4.5,8.5)%
\end{tiny}%
\psplot[algebraic=true]{-4.5}{4.5}{x^2-3*x+2}%
\psplot[algebraic=true]{-4.5}{4.5}{-x^2-x+6}%
\end{pspicture*}%
}
\end{document}
