Bonjour.

Exercice 3 :

A = 4x + 28

A = 4 × (x + 7)

B = 2/3x + 14/3

B = 2/3 × (x + 7)

C = 0,5x + 3,5

C = 0,5 × (x + 7)

D = - 5x - 35

D = - 5 × (x + 7)

Exercice 4 :

E = 3x² + 5xy

E = x × (3x + 5y)

F = 25ab - 10a² + 30a

F = a × (25b - 10a + 30)

G = 4x × (5 + 3x) + 7 × (5 + 3x)

G = (5 + 3x)(4x + 7)

Exercice 5 :

M = (x + 2)(x - 4) + (x + 2)(x - 5)

M = (x + 2)(x - 4 + x - 5)

Bonne journée :)