Let $\mathrm{A}=\left[\begin{array}{ccc}2 & 1 & 3 \\ 4 & -1 & 0 \\ -7 & 2 & 1\end{array}\right]$
Therefore,
$A^{-1}$ exists
A11 = , A12 = ,
A13 = , A21 = ,
A22 = , A23 = ,
A31 = , A32 = ,
A33 =
adj. A =
Let $\mathrm{A}=\left[\begin{array}{ccc}2 & 1 & 3 \\ 4 & -1 & 0 \\ -7 & 2 & 1\end{array}\right]$
Therefore,
$A^{-1}$ exists
A11 = , A12 = ,
A13 = , A21 = ,
A22 = , A23 = ,
A31 = , A32 = ,
A33 =
adj. A =