TeX Quellcode:

\begin{array}{rclll} \genfrac{}{}{1pt}{0}{\frac{14c}{-5}}{\frac{-18c}{25a}} &=& \dfrac{14c}{-5} : \dfrac{-18c}{25a} \cr\cr &=& -\dfrac{14c}{5} \cdot \left(-\dfrac{25a}{18c}\right) \cr\cr &=& -\dfrac{7}{1} \cdot \left(-\dfrac{5a}{9}\right) \cr\cr &=& \dfrac{35a}{9} \end{array}