27)(3): 0,2-

27) $$\left(\frac{1}{5}\right)^4 : 0.2 = \left(\frac{1}{5}\right)^4 : \frac{1}{5} = \left(\frac{1}{5}\right)^4 : \left(\frac{1}{5}\right)^1 = \left(\frac{1}{5}\right)^{4-1} = \left(\frac{1}{5}\right)^3 = \frac{1}{5^3} = \frac{1}{125}$$

Ответ: 1/125