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Lucianvirgil
a fost răspuns

8/15 < 4/2n +1 < sau = 2/3

Răspuns :

Mikkka
inversam fractiile

3/2≤ 2n+1/4 < 15/8  
12/8 ≤ 4n+2 < 15/8
12≤ 4n+2 <15 /-2
10 ≤ 4n < 13  /:4
10/4 ≤ n < 13/4
daca n∈ R ⇒ n∈ [5/2 ; 13/4)

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