TeX Quellcode:

\begin{matrix} \left|\begin{pmatrix}-\frac{3}{10}\cr-\frac{7}{3} \end{pmatrix}\right| &=& \sqrt{{\left(-\dfrac{3}{10}\right)}^2+{\left(-\dfrac{7}{3}\right)}^2 } \cr &=& \sqrt{\dfrac{4981}{900}} &\approx & 2{,}35 \end{matrix}