$\"\"$

The matrices are $\"\"$ and $\"\"$ .

Find $\"\"$ .

$\"\"$ (Original expression)

$\"\"$ (Substitute $\"\"$ and $\"\"$ )

$\"\"$ (Add: $\"\"$ )

$\"\"$ (Simplify)

Therefore, the value of matrix $\"\"$ is $\"\"$ . $\"\"$

The operation of results $\"\"$ is $\"\"$ .