TeX Quellcode:
\begin{array}{rclll} 4\cdot \left(\dfrac{1}{2}-\dfrac{1}{3}\right)+5\left(\dfrac{1}{5}-\dfrac{1}{3}\right) &=& 0 \cr\cr 4\cdot\dfrac{1}{6}+5\cdot\left(-\dfrac{2}{15}\right) &=& 0 \cr\cr \dfrac{2}{3}-\dfrac{2}{3} &=& 0 \cr\cr 0 &=& 0 \end{array}