Question

7 ПРИМЕР УМОЛЯЮ!!!!!!!!

Answer 1

$\frac{18^{n-1} }{3^{n+1}}=\frac{3^{n-1}*6^{n-1}}{3^{n+1}}=3^{n-1-n-1}*6^{n-1}=3^{-2}*6^{n}*6^{-1}=\frac{1}{9}*81*\frac{1}{6} =\\\\=\frac{81}{9*6} =\frac{3}{2}=\boxed{1,5}$