[2−5−52]\left[\begin{array}{rr}2 & -5 \\-5 & 2\end{array}\right][2−5−52]
[0055]\left[\begin{array}{ll}0 & 0 \\5 & 5\end{array}\right][0505]
[−600−6]\left[\begin{array}{rr}-6 & 0 \\0 & -6\end{array}\right][−600−6]
[4400]\left[\begin{array}{ll}4 & 4 \\0 & 0\end{array}\right][4040]
