查看原题
求矩阵 $H=\left(\begin{array}{ccccc}1 & -b & & & \\ & 1 & -b & & \\ & & \ddots & \ddots & \\ & & & 1 & -b \\ & & & & 1\end{array}\right)$ 的逆矩阵.
                        
不再提醒