TeX Quellcode:

\dfrac{\sqrt[3]{a}}{\sqrt{a^9}} = \dfrac{a^\frac{1}{3}}{a^\frac{9}{2}} = a^{\frac{1}{3}-\frac{9}{2}} = a^{-\frac{25}{6}} = \dfrac{1}{a^\frac{25}{6}} = \dfrac{1}{\sqrt[6]{a^{25}}}