Sagot :

Réponse:

f(-2) = -2 × (-2) +7

4+7

11

f(1/3)= -2 × (1/3) +7

-2/3 +7

-2/3 + 7/1

-2/3 + ((7/1) ×3)

-2/3 + 21/3

19/3