TeX Quellcode:

\begin{array}{rcl} \genfrac{}{}{1pt}{0}{\frac{23x^{66}}{3y^4}}{20x^{66}y^4} &=& \dfrac{23x^{66}}{3y^4} : \left(20x^{66}y^4\right) \\\\&=& \dfrac{23x^{66}}{3y^4} \cdot \dfrac{1}{20x^{66}y^4} \\\\&=& \dfrac{23}{3y^4} \cdot \dfrac{1}{20y^4} \\\\&=& \dfrac{23}{60y^8} \end{array}