$\"\"$

The expression is $\"\"$ .

$\"\"$ (Substitute a = 3, b = 0.3, c = $\"\"$ , d = $\"\"$ )

$\"\"$

First operation is multiplication.

$\"\"$ (Multiply: $\"\"$ )

Next operation is subtraction.

$\"\"$ (Subtract: $\"\"$ )

Numerator value is zero the expression value becomes zero.

$\"\"$

The value of the expression is 0.