[20.5]\left[\begin{array}{c}2 \\0.5\end{array}\right][20.5]
[16−20.53]\left[\begin{array}{cc}16 & -2 \\0.5 & 3\end{array}\right][160.5−23]
[0.5−2]\left[\begin{array}{ll}0.5 & -2\end{array}\right][0.5−2]
[−16230.5]\left[\begin{array}{cc}-16 & 2 \\3 & 0.5\end{array}\right][−16320.5]
NoneNoneNone