Question

Determinati n apartine N pt care : 1/9<(n+1) la puterea a doua /27<2/3 HEEELPPP DAU 25 P... AS DORI O EXPLICATIE MAI DETALIATA multumeesc​

Answer 1

Răspuns:

n€{1, 2, 3}

Explicație pas cu pas:

Poza

Answer 2

$\it \dfrac{1}{9}<\dfrac{(n+1)^2}{27}<\dfrac{2}{3}|_{\cdot27} \Rightarrow 3 <(n+1)^2 <18 \Rightarrow (n+1)^2\in\{4,\ 9,\ 16\} \Rightarrow \\ \\ \\ \Rightarrow n+1\in\{2,\ 3,\ 4\}|_{-1} \Rightarrow n\in\{1,\ 2,\ 3\}$