Ответ:
- \(\dfrac{28^5}{7^5\cdot4^5}=\left(\dfrac{28}{7\cdot4}\right)^5=1\).
- \(\dfrac{3^{16}\cdot2^{19}}{54^5}=\dfrac{3^{16}\cdot2^{19}}{(2\cdot3^3)^5}=2^{19-5}\cdot3^{16-15}=2^{14}\cdot3=49152\).
- \(\dfrac{18^4}{12^5}=\dfrac{(2\cdot3^2)^4}{(2^2\cdot3)^5}=\dfrac{2^4\cdot3^8}{2^{10}\cdot3^5}=\dfrac{3^3}{2^6}=\dfrac{27}{64}\).
