Răspuns: [tex]\purple{\bf ~A= \{2;~3\}~}[/tex]
Explicație pas cu pas:
[tex]\bf A= \big\{ n\in \mathbb{N}~\big|~1<\sqrt{n}<2 \big\}[/tex]
[tex]\bf 1<\sqrt{n}<2~~~\bigg|^{2}[/tex]
[tex]\bf 1^{2}~<~(\sqrt{n})^{2}~<~2^{2}[/tex]
[tex]\bf 1~<~n~<~4\implies \red{\underline{n \in \{2;~3\}}}[/tex]
[tex]\purple{\boxed{\bf ~A= \{2;~3\}~}}[/tex]
[tex]==pav38==[/tex]
