%@P:exocorcp
%@Dif:3
Reproduis et complète le tableau suivant :
\begin{center}
  \begin{tabular}{|c|c|c|c|}
\hline
$a$&$b$&$a\times b$&Troncature à l'unité de $a\times b$\\
\hline
1,2&1,2&&\\
\hline
4,5&1,3&&\\
\hline
1,5&4,2&&\\
\hline
2,7&2,4&&\\
\hline
3,1&6,9&&\\
\hline
  \end{tabular}
\end{center}
%@Correction:
\begin{center}
  \begin{tabular}{|c|c|c|c|}
\hline
$a$&$b$&$a\times b$&Arrondi à l'unité de $a\times b$\\
\hline
\opcopy{1.2}{a}\opprint{a}&\opcopy{1.2}{b}\opprint{b}&\opmul[style=text]{a}{b}\opmul*{a}{b}{c}&\opround{c}{0}{c}\opprint{c}\\
\hline
\opcopy{4.5}{a}\opprint{a}&\opcopy{1.3}{b}\opprint{b}&\opmul[style=text]{a}{b}\opmul*{a}{b}{c}&\opround{c}{0}{c}\opprint{c}\\
\hline
\opcopy{1.5}{a}\opprint{a}&\opcopy{4.2}{b}\opprint{b}&\opmul[style=text]{a}{b}\opmul*{a}{b}{c}&\opround{c}{0}{c}\opprint{c}\\
\hline
\opcopy{2.7}{a}\opprint{a}&\opcopy{2.4}{b}\opprint{b}&\opmul[style=text]{a}{b}\opmul*{a}{b}{c}&\opround{c}{0}{c}\opprint{c}\\
\hline
\opcopy{3.1}{a}\opprint{a}&\opcopy{6.9}{b}\opprint{b}&\opmul[style=text]{a}{b}\opmul*{a}{b}{c}&\opround{c}{0}{c}\opprint{c}\\
\hline
  \end{tabular}
\end{center}
\opcopy{1.2}{a}\opcopy{1.2}{b}\opmul{a}{b}\kern1cm
\opcopy{4.5}{a}\opcopy{1.3}{b}\opmul{a}{b}\kern1cm
\opcopy{1.5}{a}\opcopy{4.2}{b}\opmul{a}{b}\kern1cm
\opcopy{2.7}{a}\opcopy{2.4}{b}\opmul{a}{b}\kern1cm
\opcopy{3.1}{a}\opcopy{6.9}{b}\opmul{a}{b}