TeX Quellcode:
\begin{array}{rclll} 3\left(5\cdot\dfrac{10}{17}+1\right)-3\cdot\dfrac{10}{17}&=&21-2\left(4+\dfrac{5}{2}\cdot\dfrac{10}{17}\right) \cr\cr 3\left(\dfrac{50}{17}+1\right)-\dfrac{30}{17}&=&21-2\left(4+\dfrac{25}{17}\right) \cr\cr 3\cdot\dfrac{67}{17}-\dfrac{30}{17}&=&21-2\cdot\dfrac{93}{17} \cr\cr \dfrac{201}{17}-\dfrac{30}{17}&=&21-\dfrac{186}{17} \cr\cr \dfrac{171}{17}&=&\dfrac{171}{17} \end{array}