Вычислите:

1. a) $$3^8 : 3^5 = 3^{8-5} = 3^3 = 27$$
2. b) $$\frac{7^9}{7^7} = 7^{9-7} = 7^2 = 49$$
3. в) $$(-3)^4 \cdot (-3) = (-3)^4 \cdot (-3)^1 = (-3)^{4+1} = (-3)^5 = -243$$
4. г) $$\frac{(3^6)^3 \cdot (3^4)^3}{(3^7)^4} = \frac{3^{6\cdot3} \cdot 3^{4\cdot3}}{3^{7\cdot4}} = \frac{3^{18} \cdot 3^{12}}{3^{28}} = \frac{3^{18+12}}{3^{28}} = \frac{3^{30}}{3^{28}} = 3^{30-28} = 3^2 = 9$$
5. д) $$(2^5)^2 \cdot (2^3)^4 : (2^4)^2 = 2^{5\cdot2} \cdot 2^{3\cdot4} : 2^{4\cdot2} = 2^{10} \cdot 2^{12} : 2^8 = 2^{10+12} : 2^8 = 2^{22} : 2^8 = 2^{22-8} = 2^{14} = 16384$$