TeX Quellcode:

\dfrac{9}{11} \, + \, \dfrac{3}{4} \, = \, \dfrac{9\cdot 4}{11\cdot 4} \, + \, \dfrac{3\cdot 11}{4\cdot 11} \, = \, \dfrac{36}{44} \, + \, \dfrac{33}{44} \, = \, \dfrac{69}{44} \, = \, 1\dfrac{25}{44}