3.075 : 1.5 -1/4 (1/25 +3.26)

First, let's simplify the expression in the parentheses:
1/25 + 3.26 = 0.04 + 3.26 = 3.3

Now, let's substitute this back into the original expression:
3.075 : 1.5 - 1/4 (3.3)

Next, simplify the division operation:
3.075 ÷ 1.5 = 2.05

Now, substitute this back into the expression:
2.05 - 1/4 (3.3)

Now, simplify the multiplication within the parentheses:
2.05 - 1/4 (3.3) = 2.05 - 0.825

Finally, perform the subtraction to get the final answer:
2.05 - 0.825 = 1.225

Therefore, the final result of the expression 3.075 : 1.5 - 1/4 (1/25 + 3.26) is 1.225.