TeX джерело:

A_{12}\,=\,-\,\left|\begin{array}{rr}1&2\\3&2\end{array}\right|=4,\;\; A_{22}\,=\,-\,\left|\begin{array}{rr}2&-1\\3&2\end{array}\right|=7,\;\; A_{32}\,=\,-\,\left|\begin{array}{rr}2&2\\1&-1\end{array}\right|=-5,\;\;