bonjour,
A = f (2) = 1
B = 3 + 5 = 8
C = f ( 4) = 5
code = 1 8 5 14
g (x) = ( 3 x - 9 ) / 4
D = g ( - 5) = ( - 15 - 9 ) / 4 = - 6
E = antécédent de 3
( 3 x - 9) / 4 = 3
3 x - 9 = 12
3 x = 12 + 9
3 x = 21
x = 7
E = 7
code = - 6 7 13
x
x + 5
x + 5 - 3 x = - 2 x + 5
2 ( - 2 x + 5 ) = - 4 x + 10
- 4 x + 10 + 2
= - 4 x + 12
f ( - 2) = 8 + 12 = 20
- 4 x + 12 = 60
- 4 x = 60 - 12
- 4 x = 48
x = - 12
F = 20
G = - 12
F + G = 8
H = 3
I = 3
J = - 2.5
H + I + J = 3.5
