Răspuns:
Explicație pas cu pas:
Rezolvam pe rand inecuatiile si facem intersectia:
15 < 2x | : 2 -> x > 15/2 -> x > 7.5
2x [tex]\leq[/tex] 31 | : 2 -> x [tex]\leq[/tex] 31/2 -> x [tex]\leq[/tex] 15.5
x ∈ N si 7.5 < x [tex]\leq[/tex] 15.5 -> x poate lua valorile: 8, 9, 10, 11, 12, 13, 14, 15
-> multimea A = {8, 9, 10, 11, 12, 13, 14, 15}
