TeX Quellcode:
\begin{array}{rcl} \dfrac{y+2}{y-2}-\dfrac{2y- 2}{y+4} &=& \dfrac{(y+2)(y+4)}{(y-2)(y+4)}-\dfrac{(2y-2)(y-2)}{(y+4)(y-2)} \cr \cr &=& \dfrac{y \cdot y +6y+8}{(y-2)(y+4)}-\dfrac{2y \cdot y-6y+4}{(y-2)(y+4)} \cr \cr &=& \dfrac{y \cdot y+6y+8-(2y \cdot y-6y+4)}{(y- 2)(y+4)} \cr \cr &=& \dfrac{-y \cdot y+12y+4}{(y-2)(y+4)} \end{array}