Question

Determină numerele naturale "n" pentru care 4/15 < 4/n <1/3 .

Answer 1

Răspuns

4/15 < 4/n <=> 4*n < 4*15 <=> n < 15

4/n < 1/3 <=> n*1 > 4*3 <=> n > 12

=> n = {13, 14}

Explicație pas cu pas:

Answer 2

$\it \dfrac{4}{15}<\dfrac{4}{n}<\dfrac{^{4)}1}{\ 3} \Rightarrow \dfrac{4}{15}<\dfrac{4}{n}<\dfrac{4}{12} \Rightarrow 12<n<15\Rightarrow n\in\{13,\ 14\}$