$\"\"$

The expression is $\"\"$ .

$\"\"$ (Group powers with the same base)

$\"\"$ (Apply zero exponent property: $\"\"$ )

$\"\"$ (Apply quotient of powers property: $\"\"$ )

$\"\"$ (Substitute quotient of powers $\"\"$ )

$\"\"$ (Apply negative exponents property: $\"\"$ )

Therefore, the simplified expression is $\"\"$ . $\"\"$

$\"\"$ .