markdown 2x2逆行列 latex

<div style="padding-left: 2em">
[tex:
A = \left(
   \begin{array}{ccc}
     a & b \\
     c & d
   \end{array}
\right)


A^-1 = \frac{1}{ad - bc}\left(
   \begin{array}{ccc}
     d & -b \\
     -c & a
   \end{array}
\right)
]
</div>

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