TeX Quellcode:

\genfrac{}{}{1pt}{0}{\frac{29a}{-60b}}{\dfrac{-c}{4b^2}} = \dfrac{29a}{-60b} : \left( \dfrac{-c}{4b^2} \right) = -\dfrac{29a}{60b} \cdot \left( -\dfrac{4b^2}{c} \right) = -\dfrac{29a}{15} \cdot \left( -\dfrac{b}{c} \right) =\dfrac{29ab}{15c}