Question

Daca A={ x apartine N* I 4<2x<(sau egal)13} A=?

Answer 1

$4<2x\leq 13$ Imparti relatia prin 2
$2<x\leq \frac{13}{2}=6.5$ numerele naturale care indeplinesc aceste conditii sunt
A={3,4,5,6}