<img class=jc-formula data-tex=\begin{ pmatrix } 1 -2 \\ -2 4 \end{ pmatrix } src=https://huaweicloudobs.ahjxjy.cn/71812DE6802D9FABD43F12DF9278DA5D.png style=vertical-align: middle;/><img class=jc-formula data-tex=\begin{ pmatrix } 2 6 \\ 1 3 \end{ pmatrix } src=https://huaweicloudobs.ahjxjy.cn/276BE9C9C4E2B45DB7A52FD554F53597.png style=vertical-align: middle;/>=
①
<img class=jc-formula data-tex=\begin{ pmatrix } 1 0 \\ 0 1 \end{ pmatrix } src=https://huaweicloudobs.ahjxjy.cn/BF2D6F23EBBDEF3D6E2D6B4CF89B08FD.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=\begin{ pmatrix } 0 0 \\ 0 0 \end{ pmatrix } src=https://huaweicloudobs.ahjxjy.cn/CE1ECC964B92735FCAEE509E835FBD6D.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=\begin{ pmatrix } -1 1 \\ 0 0 \end{ pmatrix } src=https://huaweicloudobs.ahjxjy.cn/084C469FB6F0DEEC86A2AEE5D33934CC.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=\begin{ pmatrix } 0 1 \\ 1 0 \end{ pmatrix } src=https://huaweicloudobs.ahjxjy.cn/99401CE41DA23E95B215E0A388AE7095.png style=vertical-align: middle;/>