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$\left|\begin{array}{ccccc}
2 & 0 & \cdots & 0 & 2 \\
-1 & 2 & \cdots & 0 & 2 \\
\vdots & \vdots & & \vdots & \vdots \\
0 & 0 & \cdots & 2 & 2 \\
0 & 0 & \cdots & -1 & 2
\end{array}\right|$
                        
不再提醒