Question

Answer 1

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Answer 2

\(\Rightarrow\dfrac{159}{13}< 3a< \dfrac{33}{2}\\ \Rightarrow\dfrac{318}{26}< 3a< \dfrac{429}{26}\\ \Rightarrow12,2< 3a< 16,5\)

Mà \(a\in N\) nên \(3a\in N\)

\(\Rightarrow3a=15\Rightarrow a=5\)