[m]\sqrt[3]{0,125}=\sqrt[3]{0,5^{3}}=0,5^{\frac{3}{3}}=0,5^{1}=0,5[/m]
1.3 [m](x^{\frac{1}{2}})^{8}=x^{\frac{1}{2}\cdot 8}=x^{4}[/m]
2.3
[m] \frac{m^{\frac{1}{2}}-6m^{\frac{1}{4}}+9}{m^{\frac{1}{2}}-9}=\frac{(m^{\frac{1}{4}}-3)^2}{(m^{\frac{1}{4}}-3)\cdot (m^{\frac{1}{4}}+3)}=\frac{m^{\frac{1}{4}}-3}{m^{\frac{1}{4}}+3}[/m]