TeX Quellcode:

\begin{matrix} \left|-\dfrac{1}{12}\begin{pmatrix}48\cr-72\cr-12\end{pmatrix}\right| &=& \left|\begin{pmatrix}-4\cr6\cr1\end{pmatrix}\right| \cr \cr &=& \sqrt{{\left(-4\right)}^2+{6}^2+{1}^2 } \cr &=& \sqrt{53} &\approx & 7{,}28 \end{matrix}