bonjour,
A = 2 - x + 3 + 4 x - 4
A = 3 x + 1
B = 5 x + 5 - 2 x - 4
B = 3 x + 1
C = x² +2 x - x² + x + 1
C = 3 x + 1
donc A = B = C
d = 3 x - 7 + 2 x - 5 + 3 x + 10
d = 8 x - 2
D = 2 ( 4 x - 1 )
E = 15 x² - 3 x - 10 x + 2
e = 15 x² - 13 x + 2
F = 3 x - 10 x + 2
F = - 7 x + 2
g = 3 x - 2 + 5 x - 1
G = 8 x - 3
H = 3 x - 2 - 5 x + 1
H = - 2 x - 1