what is this?

[Herbert Fritsch]

Hi,
I'm a real beginner with python and I don't really know if I will get it.
But here is one of my first exercises:

Python 2.3+ (#1, Sep 23 2003, 23:07:16)
[GCC 3.3.1 (SuSE Linux)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> a = 3
>>> b = 4
>>> b / 2 + a
5
>>> b / (2.0 + a)
0.80000000000000004

There must be something wrong. I' running the new Suse 9.0.

Herbert