Question

Se considera multimea A={x∈R | -1≤2x+3 ≤7} Enumerati elementele multimii A ∩ N .

Answer 1

-1 ≤ 2x+3 ≤7 |-3

-4 ≤ 2x  ≤ 4  |:2

-2 ≤ x ≤ 2  =>A= { -2, -1, 0,1,2}

A intersectat N ={0,1,2}