>>> from equacio2 import calcula_arrels

>>> calcula_arrels(1.0, 2.0, 3.0)
(0, 0, 0)
>>> calcula_arrels(1.0, 2.0, -3.0)
(2, -3.0, 1.0)
>>> calcula_arrels(1.0, 2.0, 1.0)
(1, -1.0, 0)

>>> '({:d}, {:.3f}, {:.3f})'.format(*calcula_arrels(-1.2, -2.1, -8.22))
'(0, 0.000, 0.000)'
>>> '({:d}, {:.3f}, {:.3f})'.format(*calcula_arrels(-1.2, 19.1, 3.118))
'(2, -0.162, 16.078)'
>>> '({:d}, {:.3f}, {:.3f})'.format(*calcula_arrels(20.2, 0, 0))
'(1, 0.000, 0.000)'