28028.3[2.7.(2+4^3)] 128-{3.[2.5^2-[21+2.4)]}+4.27

To solve these expressions, we'll follow the order of operations (also known as PEMDAS/BODMAS).

Let's start with the first expression:

e, 28028.3[2.7.(2+4^3)]

First, we calculate the exponent: 4^3 = 64.
Next, we perform the multiplication inside the parentheses: 2 + 64 = 66.
Then, we multiply 2.7 by 66: 2.7 * 66 = 178.2.
Finally, we multiply 28028.3 by 178.2: 28028.3 * 178.2 = 4999999.26.

Therefore, e = 4999999.26.

Now, let's move on to the second expression:

f, 128 - {3.[2.5^2 - [21 + 2.4)]} + 4.27

First, we calculate the innermost parentheses: 21 + 2.4 = 23.4.
Next, we calculate the exponent: 2.5^2 = 6.25.
Then, we subtract 23.4 from 6.25: 6.25 - 23.4 = -17.15.
After that, we multiply 3 by -17.15: 3 * -17.15 = -51.45.
Now, we calculate the outermost parentheses: -51.45.
Next, we subtract -51.45 from 128: 128 - (-51.45) = 128 + 51.45 = 179.45.
Finally, we add 179.45 to 4.27: 179.45 + 4.27 = 183.72.

Therefore, f = 183.72.

I hope this helps! Let me know if you have any further questions.