Yutenony Bonjour,

Exercice 1 :

1) = f(4) = -1
2) = f(3) = 0
3) = f(0.5) = -2

Exercice 2 :

A = (2a+3)(1-a)     
A = 2a*1-2a²+3-3a
A = -2a²+2a*(-3a)+3
A = -2a²+6a²+3
A = 4a²+3

B = 2(x+2)-(5-x)
B = 2x+4-10-2x
B = x-6

Exercice 4 :

E = 4-1 = 3
E = 3*5
E = 15

F = -10-1 = -11
F = -11*-9
F = 99

Voilà, j'espère que tu as compris.