Exercice 27 :
↓ Enoncé :
Calculer :
- \( = 15 - (6 + 2 \times 5) \)
- \( = (30 \div 6) \times (12 - 8) \)
- \( = 4 \times (3 + 7) \div 2 \)
- \( = (18 - 4) \times (6 \div 3) \)
↓ Solution :
- \(
\begin{align}
15 - (6 + 2 \times 5) &= 15 - (6 + 10) \\
&= 15 - 16 \\
&= -1
\end{align}
\)
- \(
\begin{align}
(30 \div 6) \times (12 - 8) &= 5 \times 4 \\
&= 20
\end{align}
\)
- \(
\begin{align}
4 \times (3 + 7) \div 2 &= 4 \times 10 \div 2 \\
&= 40 \div 2 \\
&= 20
\end{align}
\)
- \(
\begin{align}
(18 - 4) \times (6 \div 3) &= 14 \times 2 \\
&= 28
\end{align}
\)