Réponse :
bonjour
Explications étape par étape
EXERCICE 1 : A = 5 ( 3x + 2 ) = 5 ×3x + 5 × 2 = 15x + 10 / B = -3 (2x – 5) = -3 × 2x – 3 × (-5 = -6x + 15 / C = 5x (-3x + 2) = 5x × (-3x) + 5x × 2 = -15x² + 10x / D = -4 (5x – 2) = -4 × 5x – 4 × (-2) = -20x + 8 EXERCICE 2 A = 3(2x – 4) + 5(3 – x) B = 2x(5 + 3x) – 4(x + 5)
A = 6x – 12 + 15 – 5x B = 10x + 6x² – 4x – 20
A = x + 3 B = 6x² + 6x – 20: