To simplify this expression, we first need to perform the operations within the parentheses:

4/5 1.25 = 1 1.25 = 1.25

2.5:1.25 = 2.5 / 1.25 = 2

Now we have: 1.25; 2: 0.05

Therefore, the simplified expression is 1.25; 2; 0.05.