TeX Quellcode:

\begin{matrix} \left|\begin{pmatrix}16\cr-12\cr-\frac 27 \end{pmatrix}\right| &=& \sqrt{{16}^2+{(-12)}^2+{\left(-\dfrac{2}{7}\right)}^2 } \cr &=& \sqrt{\dfrac{19604}{49}} &\approx & 20{,}00 \end{matrix}