Question

Fie A={0,1,2,3} si B={x apartine N\ 3x -2 mai < sau egal 7 demostrati ca A=B

Answer 1

Rezolvam inecuatia 3x≤9 rezulta x∈{0,1,2 3}. Deci B∈{0,1,2,3}=A={0,1,2,3}