%@metapost:5fractionsexo54.mp %@Auteur:Thierry Gauvin\par \begin{multicols}{2} \begin{tabular}{>\centering m{2.5cm}@{+}>\centering m{2.5cm}@{= }m{2.5cm}} \includegraphics{5fractionsexo54.10}&\includegraphics{5fractionsexo54.10}&\includegraphics{5fractionsexo54.10}\\ $\dfrac{1}{2}$ & $\dfrac{1}{4}$ & $\dfrac{\ldots}{\ldots}+\dfrac{1}{4}=\dfrac{\ldots}{\ldots}$ \end{tabular} \begin{tabular}{>\centering m{2.5cm}@{+}>\centering m{2.5cm}@{= }m{2.5cm}} \includegraphics{5fractionsexo54.26}&\includegraphics{5fractionsexo54.26}& \includegraphics{5fractionsexo54.26}\\ $\dfrac{1}{4}$ & $\dfrac{7}{20}$ & $\dfrac{\ldots}{\ldots}+\dfrac{7}{20}=\dfrac{\ldots}{\ldots}$ \end{tabular} \vspace{.4cm} \begin{tabular}{>\centering m{2.5cm}@{+}>\centering m{2.5cm}@{= }m{2.5cm}} \includegraphics{5fractionsexo54.18}&\includegraphics{5fractionsexo54.18}&\includegraphics{5fractionsexo54.18}\\ $\dfrac{1}{8}$ & $\dfrac{1}{2}$ & $\dfrac{1}{8}+\dfrac{\ldots}{\ldots}=\dfrac{\ldots}{\ldots}$ \end{tabular} \begin{tabular}{>\centering m{2.5cm}@{+}>\centering m{2.5cm}@{= }m{2.5cm}} \includegraphics{5fractionsexo54.30}&\includegraphics{5fractionsexo54.30}&\includegraphics{5fractionsexo54.30}\\ $\dfrac{1}{3}$ & $\dfrac{2}{9}$ & $\dfrac{\ldots}{\ldots}+\dfrac{2}{9}=\dfrac{\ldots}{\ldots}$ \end{tabular} \end{multicols} \textbf{Complète la règle :} \begin{center} \psshadowbox{\begin{minipage}{0.9\linewidth} \textit {Quand les dénominateurs sont \ldots\ldots\ldots, on ne peut pas ajouter les \ldots\ldots\ldots\ldots. On doit transformer les \ldots\ldots\ldots\ldots pour les rendre \ldots\ldots, ensuite on peut \ldots\ldots\ldots\ldots les nouveaux numérateurs.} \end{minipage} } \end{center}