a) $$13^{100}:13^{98} = 13^{100-98} = 13^2 = 169$$.
б) $$\frac{3^8 \cdot 2^7}{3^6 \cdot 2^5} = 3^{8-6} \cdot 2^{7-5} = 3^2 \cdot 2^2 = 9 \cdot 4 = 36$$.
в) $$2^{14}:8^4 = 2^{14}:(2^3)^4 = 2^{14}:2^{12} = 2^{14-12} = 2^2 = 4$$.
г) $$\frac{9^5 \cdot 5^9}{3^9 \cdot 5^{10}} = \frac{(3^2)^5 \cdot 5^9}{3^9 \cdot 5^{10}} = \frac{3^{10} \cdot 5^9}{3^9 \cdot 5^{10}} = 3^{10-9} \cdot 5^{9-10} = 3^1 \cdot 5^{-1} = \frac{3}{5} = 0.6$$.