Bonsoir,
Exercice 1 :
A = 7x + 4x + 4 + 2x
= 13x + 4 ✅
B = 8x + 10x - 6x + 4x
= 18x - 2x = 16x ✅
C = -4x - 2x - 3 + 7x
= -6x + 7x - 3 = x - 3 ✅
D = -4x + 5 + x - 6x
= -10x + x + 5 = -9x + 5 ✅
Exercice 2 :
A = 5(2x + 1)
= 5 × 2x + 5 × 1
Tu peux réduire :
= ___________
B = -(1 - x)
= -1(1 - x) = -1 × 1 - 1 × (-x)
= -1 + x ✅
C = -3(2 - 5x)
= -3 × 2 - 3 × (-5x)
= -6 + 15x ✅
D = (2x + 1)(3x + 4)
= 2x × 3x + 2x × 4 + 1 × 3x + 1 × 4
= 6x² + 8x + 3x + 4
= 6x² + 11x + 4 ✅
Bonne soirée !
