Exercice 26 :
↓ Enoncé :
Calculer :
- \( = 7 \times (12 - 5) + 4 \)
- \( = (18 + 6) \div (5 - 2) \)
- \( = 20 - 4 \times (9 - 6) \)
- \( = (8 + 2) \times (5 + 3) \)
↓ Solution :
- \(
\begin{align}
7 \times (12 - 5) + 4 &= 7 \times 7 + 4 \\
&= 49 + 4 \\
&= 53
\end{align}
\)
- \(
\begin{align}
(18 + 6) \div (5 - 2) &= 24 \div 3 \\
&= 8
\end{align}
\)
- \(
\begin{align}
20 - 4 \times (9 - 6) &= 20 - 4 \times 3 \\
&= 20 - 12 \\
&= 8
\end{align}
\)
- \(
\begin{align}
(8 + 2) \times (5 + 3) &= 10 \times 8 \\
&= 80
\end{align}
\)