Exercice 28 :
↓ Enoncé :
Calculer :
- \( = (25 \div 5) + (14 - 6) \)
- \( = 12 \times (8 \div 4) - 7 \)
- \( = 9 + (5 \times 3) - (4 \times 2) \)
- \( = (16 - 8) \times (10 - 7) \)
↓ Solution :
- \(
\begin{align}
(25 \div 5) + (14 - 6) &= 5 + 8 \\
&= 13
\end{align}
\)
- \(
\begin{align}
12 \times (8 \div 4) - 7 &= 12 \times 2 - 7 \\
&= 24 - 7 \\
&= 17
\end{align}
\)
- \(
\begin{align}
9 + (5 \times 3) - (4 \times 2) &= 9 + 15 - 8 \\
&= 24 - 8 \\
&= 16
\end{align}
\)
- \(
\begin{align}
(16 - 8) \times (10 - 7) &= 8 \times 3 \\
&= 24
\end{align}
\)