3. Вычислите: a) 13¹⁶ * 13⁷ / 13²¹ б) 5⁷ / (5 * 5⁵)

a) \(\frac{13^{16} \cdot 13^7}{13^{21}} = \frac{13^{16+7}}{13^{21}} = \frac{13^{23}}{13^{21}} = 13^{23-21} = 13^2 = 169\) б) \(\frac{5^7}{5 \cdot 5^5} = \frac{5^7}{5^{1+5}} = \frac{5^7}{5^6} = 5^{7-6} = 5^1 = 5\)