8) x € N* ( diferit de 0) x= 1,2,3,4 =>
A={1,2,3,4}
x € N 2< x < 5 -> x = 2,3,4 =>
B={2,3,4}
x --> corcoduș =>
D={c,o,r,d,u,s}
C = multimea vida
