bonjour
A = - 20 x²
B = 10 y - 15
C = - 72 x
D = 18 y²
E = 0.5 x * - 6 x² = - 3 x ³
F = 40 y - 20 y² - 48 + 24 y = - 20 y² + 64 y - 48
D(n) = 50 + 5 x
D (8) = 50 + 40 = 90
D (12) = 50 + 60 = 110
