(\frac{3^{-0,7}*3^{-0,9}}{9^{\frac{1}{5}}})^{\frac{1}{2}}
źródło:
(\frac{3^{-0,7}*3^{-0,9}}{9^{\frac{1}{5}}})^{\frac{1}{2}}=
=(\frac{3^{-0,7-0,9}}{(3^2)^{\frac{1}{5}}})^{0,5}=
=(\frac{3^{-1,6}}{3^{0,4}})^{0,5}=(3^{-1,6-0,4})^{0,5}=
=(3^{-2})^{0,5}=3^{-1}=\frac{1}{3}