I think it MAY be partly that you do not understand how to write numbers. Or, do you not understand how to write algebraic expressions? These are just guesses however, since we are not shown what your formulas should be.
That is, I see you writing numbers like
That is fine. However, it suggests you do not understand the same number can be written as
In another place, I see two different forms, that will yield very different results.
This is suspicious, because I am not sure if you truly intended to write what you did.
Are you looking to divide the number 1 by the large number 3.19e9? Or are you looking to form the number 1/3.19, and then to multiply that result by 1e9?
Remember that 1/2*3 is NOT the number 1/6.
So as I said, we don't know what it is that you want to write here. But I see problems in what you have written, that suggest you are confused in how you write code. I will also guess that you need to learn how to write numbers using the scientific notation form I have shown, as that will allow you to avoid needing to multiply by large powers of 10. But all of this is just a guess, based on the ways you have written these expressions.