%@P:exocorcp %@Auteur: d'après IREM Strasbourg \begin{center} \begin{tabular}{|>{\columncolor[rgb]{1,1,0}}*{7}{c|}} \hline \rowcolor{yellow}$\times$&&&4&&&\\ \hline 9&&&36&&&\\ \hline 5&&&20&&&35\\ \hline \phantom{15}&&56&&63&&\\ \hline &48&&&&16&56\\ \hline &&&16&&&\\ \hline 6&&48&&&&\\ \hline \end{tabular} \end{center} %@Correction: \begin{center} \begin{tabular}{|>{\columncolor[rgb]{1,1,0}}*{7}{c|}} \hline \rowcolor{yellow}$\times$&\textcolor{red}{6}&\textcolor{red}{8}&4&\textcolor{red}{9}&\textcolor{red}{2}&\textcolor{red}{7}\\ \hline 9&\opmul*{9}{6}{a}\textcolor{red}{\opprint{a}}&\opmul*{9}{8}{a}\textcolor{red}{\opprint{a}}&36&\opmul*{9}{9}{a}\textcolor{red}{\opprint{a}}&\opmul*{9}{2}{a}\textcolor{red}{\opprint{a}}&\opmul*{9}{7}{a}\textcolor{red}{\opprint{a}}\\ \hline 5&\opmul*{5}{6}{a}\textcolor{red}{\opprint{a}}&\opmul*{5}{8}{a}\textcolor{red}{\opprint{a}}&20&\opmul*{5}{9}{a}\textcolor{red}{\opprint{a}}&\opmul*{5}{2}{a}\textcolor{red}{\opprint{a}}&35\\ \hline \textcolor{red}{7}&\opmul*{7}{6}{a}\textcolor{red}{\opprint{a}}&56&\opmul*{7}{4}{a}\textcolor{red}{\opprint{a}}&63&\opmul*{7}{2}{a}\textcolor{red}{\opprint{a}}&\opmul*{7}{7}{a}\textcolor{red}{\opprint{a}}\\ \hline \textcolor{red}{8}&48&\opmul*{8}{8}{a}\textcolor{red}{\opprint{a}}&\opmul*{8}{4}{a}\textcolor{red}{\opprint{a}}&\opmul*{8}{9}{a}\textcolor{red}{\opprint{a}}&16&56\\ \hline \textcolor{red}{4}&\opmul*{4}{6}{a}\textcolor{red}{\opprint{a}}&\opmul*{4}{8}{a}\textcolor{red}{\opprint{a}}&16&\opmul*{4}{9}{a}\textcolor{red}{\opprint{a}}&\opmul*{4}{2}{a}\textcolor{red}{\opprint{a}}&\opmul*{4}{7}{a}\textcolor{red}{\opprint{a}}\\ \hline 6&\opmul*{6}{6}{a}\textcolor{red}{\opprint{a}}&48&\opmul*{6}{4}{a}\textcolor{red}{\opprint{a}}&\opmul*{6}{9}{a}\textcolor{red}{\opprint{a}}&\opmul*{6}{2}{a}\textcolor{red}{\opprint{a}}&\opmul*{6}{7}{a}\textcolor{red}{\opprint{a}}\\ \hline \end{tabular} \end{center}