10) $$((\frac{1}{2})^8 : (\frac{1}{2})^7) : ((\frac{1}{2})^4 : (\frac{1}{2})^6) = (\frac{1}{2})^{8-7} : (\frac{1}{2})^{4-6} = (\frac{1}{2})^1 : (\frac{1}{2})^{-2} = (\frac{1}{2})^{1-(-2)} = (\frac{1}{2})^3 = \frac{1}{8}$$
Ответ: 1/8