To simplify this expression, we first need to simplify the square roots and then perform the multiplication and division.

Starting with the square roots:
√12 can be simplified as:

√12 = √(4 * 3) = 2√3

Next, we have:

14 2√3 1/4 - √0.64/√0.16

Now, let's simplify the square roots under each division:

√0.64 = √(0.8 0.8) = 0.8
√0.16 = √(0.4 0.4) = 0.4

Substitute the values back into the expression:

14 2√3 1/4 - 0.8/0.4

Now, we simplify:

(14/4) 2√3 - 2
7 2√3 - 2
14√3 - 2

Therefore, the simplified expression is 14√3 - 2.