TeX Quellcode:
\begin{array}{rcl} \dfrac{2a}{b}+\dfrac{a}{m}+\dfrac{a}{b} &=& \dfrac{2a}{b}+\dfrac{a}{b}+ \dfrac{a}{m} \cr \cr &=& \dfrac{3a}{b}+\dfrac{a}{m} \cr \cr &=& \dfrac{3am}{bm}+\dfrac{ab}{bm} \cr \cr &=& \dfrac{3am+ab}{bm} \cr \cr &=& \dfrac{a(3m+b)}{bm} \end{array}