Bonjour ! J'espère vous aider !
Réponse :
Exercice 3 :
A = 3 (x - 2) + 5 (3 - x)
A = 3*x + 3*(- 2) + 5*3 + 5*(- x)
A = 3x - 6 + 15 - 5x
A = - 2x + 9
B = 5 (3 + 2x) - 2 (3x + 5)
B = 5*3 + 5*2x - 2*3x - 2*5
B = 15 + 10x - 6x - 10
B = 4x + 5
C = 4 (2x - 1) - 3 (3 - 2x)
C = 4*2x + 4*(- 1) - 3*3 - 3*(- 2x)
C = 8x - 4 - 9 + 6x
C = 14x - 13
D = 2 (2x + 1) + 3 (3x + 1)
D = 2*2x + 2*1 + 3*3x + 3*1
D = 4x + 2 + 9x + 3
D = 13x + 5
E = - 2 (3 - 2x) + 3 (x - 5)
E = - 2*3 - 2*(- 2x) + 3*x + 3*(- 5)
E = - 6 + 4x + 3x - 15
E = 7x - 21
F = 2 (4x - 1) - 2 (5x + 1)
F = 2*4x + 2*(- 1) - 2*5x - 2*1
F = 8x - 2 - 10x - 2
F = - 2x - 4
