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

First, let's simplify the expression inside the parentheses: 5 + 0.2 = 5.2.

Now, let's solve the expression outside the parentheses: (9/25 - 2) * 18.

To simplify further, let's calculate the value inside the parentheses: 9/25 - 2 = -1.92.

Finally, let's multiply the result by 18: -1.92 * 18 = -34.56.

Therefore, the value of the expression (9/25-2,18):(ba 4 phần 5+0,2) is -34.56.