TeX Quellcode:

\genfrac{}{}{1pt}{0} {\frac{-5}{-3}}{-\frac{25}{4}} = \dfrac{-5}{-3} : \left( -\dfrac{25}{4} \right) = \dfrac{5}{3} \cdot \left( -\dfrac{4}{25} \right) = \dfrac{1}{3} \cdot \left( -\dfrac{4}{5} \right) = - \dfrac {4}{15}