%@Auteur:Véronique Glaçon\par \begin{myenumerate} \item Rappelle les trois égalités remarquables. \begin{center} \psshadowbox{ \begin{minipage}{\linewidth-10\fboxsep} \begin{description} \item[Type \no1] $a^2+2ab+b^2=$\dotfill \item[Type \no2] $a^2-2ab+b^2=$\dotfill \item[Type \no3] $a^2-b^2=$\dotfill \end{description} \end{minipage} } \end{center} \vspace{0.4cm} \item Factorise chacune des expressions suivantes à l'aide d'une égalité remarquable. \renewcommand{\arraystretch}{1.5} \vspace{0.2cm} \begin{center} \begin{tabular}{r|c|c|c|c} \cline{2-4} &Type \no&$a$&$b$&{\bf Factorisation}\\ \cline{2-4} $x^2+4x+4$&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to7.5cm{\dotfill}\\ \cline{2-4} $x^2-25$&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to7.5cm{\dotfill}\\ \cline{2-4} $x^2-6x+9$&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to7.5cm{\dotfill}\\ \cline{2-4} $4x^2-64$&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to7.5cm{\dotfill}\\ \cline{2-4} $9x^2+24x+16$&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to7.5cm{\dotfill}\\ \cline{2-4} $x^2-2x+1$&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to 1.5cm{\dotfill}&\hbox to7.5cm{\dotfill}\\ \cline{2-4} \end{tabular} \end{center} \renewcommand{\arraystretch}{1} \end{myenumerate}