TeX Quellcode:

\begin{array}{rclll}\dfrac{\frac{29a}{-60b}}{\frac{-c}{4b^2}} &=& \dfrac{29a}{-60b} : \dfrac{-c}{4b^2} \cr \cr &=& -\dfrac{29a}{60b} \cdot \left(-\dfrac{4b^2}{c}\right) \cr\cr &=& -\dfrac{29a}{15} \cdot \left( -\dfrac{b}{c}\right) \cr\cr &=& \dfrac{29ab}{15c} \end{array}