2^2:8^{\frac{2}{3}}=
(0.008^{\frac{1}{3}})^{-2}=
2^2:8^{\frac{2}{3}}=2^2:(2^3)^{\frac{2}{3}}=2^2:2^2=1
(0.008^{\frac{1}{3}})^{-2}=(\frac{8}{10000})^{-\frac{2}{3}}=(\frac{1000}{8})^{\frac{2}{3}}=
=(\sqrt[3]{\frac{1000}{8}})^2=(\frac{10}{2})^2=5^2=25