TeX Quellcode:

2\dfrac{1}{4} \, \cdot \, \dfrac{2}{7} \, = \, \dfrac{9}{4} \, \cdot \, \dfrac{2}{7} \, = \, \dfrac{9}{2} \, \cdot \, \dfrac{1}{7} \, = \, \dfrac{9}{14}