\(2Z+N=34\Rightarrow N=34-2Z\)
Ta có \(1\le\dfrac{N}{Z}\le1,5\)
\(\Leftrightarrow1\le\dfrac{34-2Z}{Z}\le1,5\)
\(\Leftrightarrow Z\le34-2Z\le1,5Z\)
\(\Leftrightarrow\dfrac{68}{7}\le Z\le\dfrac{34}{3}\)
\(\Leftrightarrow\left[{}\begin{matrix}Z=10\\Z=11\end{matrix}\right.\)
Nếu \(Z=10\Rightarrow N=14\Rightarrow A=24\)
Nếu \(Z=11\Rightarrow N=12\Rightarrow A=22\)