28) $$\frac{1}{8} \cdot (\frac{1}{2})^4 = (\frac{1}{2})^3 \cdot (\frac{1}{2})^4 = (\frac{1}{2})^{3+4} = (\frac{1}{2})^7 = \frac{1}{128}$$
Ответ: 1/128