[m]\sqrt[4]{0,0081}=\sqrt[4]{0,3^{4}}=0,3^{\frac{4}{4}}=0,3^{1}=0,3[/m]
1.3 [m](a^{\frac{1}{5}})^{10}=a^{\frac{1}{5}\cdot 10}=a^{2}[/m]
2.3
[m] \frac{m^{\frac{2}{3}}-m^{\frac{1}{3}}}{m^{\frac{1}{3}}-1}=\frac{m^{\frac{1}{3}}\cdot (m^{\frac{1}{3}}-1)}{m^{\frac{1}{3}}-1}=m^{\frac{1}{3}}[/m]