Question

\(\frac{33^{2n}}{11^{2n}}=81\)  Tìm n \(\inℕ\) 

Answer 1

\(\frac{3^{2n}.11^{2n}}{11^{2n}}=81\Leftrightarrow3^{2n}=3^4\)

\(\Leftrightarrow2n=4\Leftrightarrow n=2\)