Exercice 24 :
↓ Enoncé :
Calculer :
- \( = [(15 - 5) \div 2] \times 3 \)
- \( = 4 \times [6 + (8 \div 2)] - 10 \)
- \( = [(18 \div 3) + (12 \div 4)] \times 2 \)
- \( = 5 \times [(24 \div 6) + (15 \div 5)] - 8 \)
↓ Solution :
- \(
\begin{align}
[(15 - 5) \div 2] \times 3 &= [10 \div 2] \times 3 \\
&= 5 \times 3 \\
&= 15
\end{align}
\)
- \(
\begin{align}
4 \times [6 + (8 \div 2)] - 10 &= 4 \times [6 + 4] - 10 \\
&= 4 \times 10 - 10 \\
&= 40 - 10 \\
&= 30
\end{align}
\)
- \(
\begin{align}
[(18 \div 3) + (12 \div 4)] \times 2 &= [6 + 3] \times 2 \\
&= 9 \times 2 \\
&= 18
\end{align}
\)
- \(
\begin{align}
5 \times [(24 \div 6) + (15 \div 5)] - 8 &= 5 \times [4 + 3] - 8 \\
&= 5 \times 7 - 8 \\
&= 35 - 8 \\
&= 27
\end{align}
\)