$\left(\begin{matrix}2&1&-1&5&7\\3&1&2&-2&-2\\5&2&1&5&3\\3&-1&3&3&-1\\2&4&3&2&2\end{matrix}\right)$

$-1060$

$\left(\begin{matrix}\frac{5}{106}&\frac{121}{530}&\frac{13}{106}&-\frac{2}{53}&-\frac{37}{265}\\-\frac{23}{106}&-\frac{69}{530}&\frac{25}{106}&-\frac{12}{53}&\frac{43}{265}\\\frac{9}{53}&\frac{27}{265}&-\frac{19}{53}&\frac{14}{53}&\frac{47}{265}\\-\frac{39}{212}&-\frac{329}{1060}&\frac{47}{212}&\frac{5}{106}&\frac{13}{530}\\\frac{67}{212}&\frac{201}{1060}&-\frac{59}{212}&\frac{5}{106}&\frac{13}{530}\end{matrix}\right)$

$9$

$\left(\begin{matrix}2&3&5&3&2\\1&1&2&-1&4\\-1&2&1&3&3\\5&-2&5&3&2\\7&-2&3&-1&2\end{matrix}\right)$

$5,5$

$\left(\begin{matrix}1&0&0&0&0\\0&1&0&0&0\\0&0&1&0&0\\0&0&0&1&0\\0&0&0&0&1\end{matrix}\right)$