Exercice 111 :
↓ Enoncé :
Calculer :
- \(\dfrac{40}{60} \times \dfrac{90}{100}\)
- \(\dfrac{36}{48} \times \dfrac{20}{54}\)
- \(\dfrac{14}{28} \times \dfrac{49}{35}\)
- \(\dfrac{33}{55} \times \dfrac{77}{99}\)
↓ Solution :
\[
\begin{align*}
\dfrac{40}{60} \times \dfrac{90}{100} &= \dfrac{3600}{6000} \\
&= \dfrac{3}{5}
\end{align*}
\]
\[
\begin{align*}
\dfrac{36}{48} \times \dfrac{20}{54} &= \dfrac{720}{2592} \\
&= \dfrac{5}{18}
\end{align*}
\]
\[
\begin{align*}
\dfrac{14}{28} \times \dfrac{49}{35} &= \dfrac{686}{980} \\
&= \dfrac{7}{10}
\end{align*}
\]
\[
\begin{align*}
\dfrac{33}{55} \times \dfrac{77}{99} &= \dfrac{2541}{5445} \\
&= \dfrac{77}{165}
\end{align*}
\]