"ڧܧݧѧ" <Godsent / mail.ru> wrote in post #1016537:
> Hallow, can anybody explain me that?
> a = (10**2 + 5**2)                  #=>  125
> b = Math.hypot(10, 5)**2        #=>  125.0
> a == b                                     #=>false

Try looking at (a-b)

For the long story see
http://docs.sun.com/source/806-3568/ncg_goldberg.html