1.
adj[102−11−2021]=[5a−2110−2−2b]\text{adj}\begin{bmatrix}1&0&2\\-1&1&-2\\0&2&1\end{bmatrix} = \begin{bmatrix}5&a&-2\\1&1&0\\-2&-2&b\end{bmatrix}, then [a  b]=[a\;b] =