Réponse :
A = 4 (x+3)
B = 3 ( 2 - 5 )
C = 7x ( 3+1 )
D = 2 ( 2 - 5x )
E = 3 ( 3x^2 + 2 )
F = x ( x - 4 )
G = 2 ( x + 1 )
H = x ( x + 1 )
I = x^2 ( 4 + 3 )
