TeX джерело:

{\;\;\left|\begin{array}{ccc} k\cdot a_{11}& a_{12}& a_{13}\\k\cdot a_{21}&a_{22}&a_{23}\\k\cdot a_{31}&a_{32}&a_{33} \end{array}\right|=\;k\cdot \left|\begin{array}{ccc}a_{11}& a_{12}& a_{13}\\ a_{21}&a_{22}&a_{23}\\ a_{31}&a_{32}&a_{33} \end{array}\right|}