Réponse:
Exercice 1 :
a) 5 × (3y + 2) = 5 × 3y + 5 × 2 = 15y + 10 .
b) 4 × (3x - 2) = 4 × 3x - 4 × 2 = 12x - 8 .
c) (5 - 4x) × x = 5 × x - 4x × x = 5x - 4x²
Exercice 2 :
a) 6(3a + 5) = 6 × 3a + 6 × 5 = 18a + 30 .
b) (b - 7) × 8 = 8 × b - 8 × 7 = 8b - 56 .
c) 4(5x - 2) = 4 × 5x - 4 × 2 = 20x - 8 .
