а) $$\begin{vmatrix} 2 & 1 & 0 & \cdots & 0 \\ 1 & 2 & 1 & \cdots & 0 \\ 0 & 1 & 2 & \cdots & 0 \\ \vdots & \vdots & \vdots & \ddots & \vdots \\ 0 & 0 & 0 & \cdots & 2 \end{vmatrix}$$

б) $$\begin{vmatrix} 3 & 2 & 0 & \cdots & 0 \\ 1 & 3 & 2 & \cdots & 0 \\ 0 & 1 & 3 & \cdots & 0 \\ \vdots & \vdots & \vdots & \ddots & \vdots \\ 0 & 0 & 0 & \cdots & 3 \end{vmatrix}$$

в) $$\begin{vmatrix} 5 & 6 & 0 & \cdots & 0 \\ 4 & 5 & 2 & \cdots & 0 \\ 0 & 1 & 3 & \cdots & 0 \\ \vdots & \vdots & \vdots & \ddots & \vdots \\ 0 & 0 & 0 & \cdots & 3 & 2 \\ 0 & 0 & 0 & \cdots & 1 & 3 \end{vmatrix}$$

г) $$\begin{vmatrix} 1 & 2 & 0 & \cdots & 0 \\ 3 & 4 & 3 & \cdots & 0 \\ 0 & 2 & 5 & \cdots & 0 \\ \vdots & \vdots & \vdots & \ddots & \vdots \\ 0 & 0 & 0 & \cdots & 5 & 3 \\ 0 & 0 & 0 & \cdots & 2 & 5 \end{vmatrix}$$