newbie seeks inaccurate arithmetic insight

[Stanley Krute]

Hi

I just started on the Python learning path.

I tried some calculator stuff, and got this
sort of result:

     http://static.userland.com/images/stanleydaily/pythonarithmetic.gif

I searched the Tutorial at http://www.python.org/doc/current/tut/tut.html
and the Reference manual at http://www.python.org/doc/current/ref/ref.html
for some discussion of why simple decimal arithmetic
gives these sorts of inaccurate results. But I couldn't find anything.

Can someone provide one or more URLs that
discuss the topic ??

Thanks

Stan