Question

Cate elemente are multimea A={x apartine N cu valori in |2x-1|≤3}

Answer 1

|2x-1| ≤ 3 ⇔
2x-1 ≤ 3 sau 2x-1 ≥ -3
x ≤ 2 sau x ≥  -1
Dar x este numar natural deci x ∈ {0,1,2}
cardA=3

Answer 2

2x-1≤3
2x≤4
x≤2⇒x=[0,1,2];⇒3 valori;
⇒numarul de elemente=cardA=3;