12.8 * 0.25 / (3/4 + (-0.125))

First simplify the expression within the parentheses:
3/4 + (-0.125) = 0.75 - 0.125 = 0.625

Now plug in the simplified value:
12.8 * 0.25 / 0.625

Calculate the multiplication first:
12.8 * 0.25 = 3.2

Now divide the result by 0.625:
3.2 / 0.625 = 5.12

So, 12.8 * 0.25 / (3/4 + (-0.125)) = 5.12.