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Determinati n ∈ N astfel incat:

3/9 < 5/n < 21/87 , n ≠ 0

Dau coroana + Multumesc !!


Răspuns :

3/9<5/n  
1/3<5/n   |*3n
n<15

5/n<21/87
5/n<7/19  |*19n
95<7n
n>95/7
n≥13

n∈{13,14}∈

O zi buna!