To solve this expression, we need to follow the order of operations (PEMDAS/BODMAS).

First, let's simplify the exponent:
(2022/2023)^0 = 1

Next, let's simplify the square:
(-2/5)^2 = 4/25

Now, let's simplify the division:
(0,4)^3 = 0.4^3 = 0.064

Now, let's substitute the simplified values back into the expression:
3 1/4 - 1 + (4/25) : 0.064

Next, let's simplify the addition and subtraction:
3 1/4 = 13/4

13/4 - 1 + (4/25) : 0.064

Now, let's simplify the division:
(4/25) : 0.064 = (4/25) * (1/0.064) = (4/25) * (25/0.64) = 4/0.64 = 25/4

Now, let's substitute the simplified values back into the expression:
13/4 - 1 + 25/4

Next, let's simplify the addition and subtraction:
(13/4) - 1 + (25/4) = (13 + 25 - 4)/4 = 34/4 = 17/2

Therefore, the final result is 17/2.