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计算下列行列式的值或矩阵的逆矩阵
(1) $\left|\begin{array}{rrrr}2 & 1 & 4 & 1 \\ 3 & -1 & 2 & 0 \\ 1 & 2 & 0 & 0 \\ 5 & 0 & 0 & 0\end{array}\right|$

(2) $\left(\begin{array}{lll}0 & 2 & 0 \\ 0 & 0 & 3 \\ 4 & 0 & 0\end{array}\right)$.
                        
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