TeX Quellcode:

\begin{array} {rcl} f_5(x_s) &=& f_5\left(\dfrac{8}{3}\right) \cr \cr &=& 4 \cdot \dfrac{8}{3}-8 \cr \cr &=& \dfrac{32}{3}-\dfrac{24}{3} \cr\cr &=& \dfrac{8}{3} \end {array}