a)
[(\frac{1}{3})^{-1}*(\frac{1}{3})^4]:(\frac{1}{3})^3]=(\frac{1}{3})^{-1+4}:(\frac{1}{3})^3=(\frac{1}{3})^3:(\frac{1}{3})^3=1
b)
[8^{-1}-3*(\frac{2}{3})^{-3}]:[5-(\frac{1}{3})^{-1}]=[\frac{1}{8}-3*(\frac{3}{2})^3]:(5-3)=(\frac{1}{8}-3*\frac{27}{8}):2=
(\frac{1}{8}-\frac{81}{8}):2=-\frac{80}{8}*\frac{1}{2}=-10*\frac{1}{2}=-5
d)
[2^{-2}-0,8*(\frac{4}{5})^{-1}]:[-(\frac{1}{2})^{-1}=[(\frac{1}{2})^2-\frac{8}{10}*\frac{4}{5}]:(-2)=(\frac{1}{4}-1):(-2)=
-\frac{3}{4}*(-\frac{1}{2})=\frac{3}{8}=0,375