Bonjour,
1)
A = (2x - 3) - (4x - 5) - (x + 3)
A = 2x - 3 - 4x + 5 - x - 3
A = 2x - 4x - x - 3 - 3 + 5
A = - 3x - 1
Moi je n en trouve aucune de bonne, désolée...
2)
A = 5 * (2x + 3)
A = 10x + 15
B = 5 + (2x + 3)
B = 5 + 2x + 3
B = 2x + 8
C = (5 + 2x) * 3
C = 15 + 6x
C = 6x + 15
D = 4 * (5x - 2)
D = 20x - 8
E = 4 * (5x * 2)
E = 4 * (10x)
E = 40x
F = 4 * (3 * x + 2)
F = 4 * (3x + 2)
F = 12x + 8