Ответ:

\(\dfrac{0.8^4\cdot0.8^5}{0.8^7}=0.8^{4+5-7}=0.8^2=0.64\).

\(\dfrac{0.2^6}{0.2^2\cdot0.2^3}=0.2^{6-2-3}=0.2^1=0.2\).

\(0.64-0.2=0.44\).

Ответ: \(0,44\).