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Determinati n ∈ N (Multimea numerelor naturale), astfel incat [tex]\frac{4n}{7} [/tex]≤[tex] \frac{14}{15} [/tex]

Răspuns :

[tex] \frac{4n}{7} \leq \frac{14}{15} \\ 15(4n) \leq 14(7) \\ 60n \leq 98 \\ n \leq \frac{98}{60} \\ n \leq \frac{49}{30} \\ [/tex]
x∈(-∞,49/30]