a) $$5^6 : 5^4 = 5^{6-4} = 5^2 = 25$$
б) $$10^{15} : 10^{12} = 10^{15-12} = 10^3 = 1000$$
в) $$0,5^{10} : 0,5^7 = 0,5^{10-7} = 0,5^3 = 0,125$$
г) $$(1\frac{1}{3})^8 : (1\frac{1}{3})^6 = (1\frac{1}{3})^{8-6} = (1\frac{1}{3})^2 = (\frac{4}{3})^2 = \frac{16}{9}$$
д) $$2,73^{13} : 2,73^{12} = 2,73^{13-12} = 2,73^1 = 2,73$$
e) $$(-\frac{2}{3})^7 : (-\frac{2}{3})^4 = (-\frac{2}{3})^{7-4} = (-\frac{2}{3})^3 = -\frac{8}{27}$$