[( \frac{81}{625})^{-0,75}:(1 \frac{2}{3})^{3}-(0,125)^{ \frac{1}{3} }]^{-2}=[((\frac{3}{5})^4)^{-\frac{3}{4}}:(\frac{5}{3})^3-((0,5)^3)^{\frac{1}{3}}]^{-2}=
[(\frac{3}{5})^{-3}:(\frac{3}{5})^{-3}-0,5]^{-2}=[(\frac{3}{5})^{-3+3}-0,5]^{-2}=[(\frac{3}{5})^0-0,5]^{-2}=(1-\frac{1}{2})^{-2}=(\frac{1}{2})^{-2}=2^2=4