bonsoir
a = 8 x + 12 x² - 4/3 - 6 x /3
a = 36 x² + 24 x - 4 - 6 x
a = 36 x² + 18 x - 4
b = 12 - 3 x + 4 x/2 - x²/2
b = 24 - 6 x + 4 x - x²
b = - x² - 2 x + 24
c = 3 x + 2 - 6 x²/5 + 4 x /5
c = 15 x + 10 - 6 x² + 4 x
c = - 6 x² + 19 x + 10
d = x²/3 - 5 x - 3 x/12 + 15/4
d = 4 x² - 60 x - 3 x + 45
d = 4 x² - 63 x + 45