TeX джерело:

A_{11}\,=\,\left|\begin{array}{rr}0&2\\1&4\end{array}\right|=-2,\;\; A_{21}\,=\,-\,\left|\begin{array}{rr}2&1\\1&4\end{array}\right|=-7,\;\; A_{31}\,=\,\left|\begin{array}{rr}2&1\\0&2\end{array}\right|=4,\;\;