Exercice 22 :
↓ Enoncé :
Calculer :
- \( = 5 \times (4 + 6) - 8 \)
- \( = (25 - 5) \div (8 - 3) \)
- \( = 9 + 4 \times (6 \div 3) - 7 \)
- \( = (20 - 8) \div (6 \div 3) + 4 \)
↓ Solution :
- \(
\begin{align}
5 \times (4 + 6) - 8 &= 5 \times 10 - 8 \\
&= 50 - 8 \\
&= 42
\end{align}
\)
- \(
\begin{align}
(25 - 5) \div (8 - 3) &= 20 \div 5 \\
&= 4
\end{align}
\)
- \(
\begin{align}
9 + 4 \times (6 \div 3) - 7 &= 9 + 4 \times 2 - 7 \\
&= 9 + 8 - 7 \\
&= 10
\end{align}
\)
- \(
\begin{align}
(20 - 8) \div (6 \div 3) + 4 &= 12 \div 2 + 4 \\
&= 6 + 4 \\
&= 10
\end{align}
\)