ajutor va rog e urgent dau coroana pls
ex 1 2 3 4 5

1. b si d
2.pt ca f(1) nu poate fi si 4 si 6
3. calculam f(-1)=0,
f(0)=1
f(1)=2
f(2)=3
Da, reprezintă o functie
4. a)A={0,1,2,3}
B={1,2,3}
b)Imf={1,2,3}
c) Gf={(0,1),(1,2),(2,2),(3,3)}
5. a)A={-1,0,1,2,3}
b) Imf={-4,0,4,8,12}
c)f(x)=2x