Bonjour,
1) a) 2/5 × 15/22 = (2×3×5)/(5×2×11) = 3/11
b) 8/3 ÷ 4 = 8/3 × 1/4 = (4×2)/(3×4) = 2/3
c) 3/11 + 2/3 = 9/33 + 22/33 = 31/33
2) a) montant des économies × 3/11 = 36
⇒ montant des économies = 36 ÷ 3/11 = 132 €
b) prix du parfum = 132 - 36 = 96 €
