>>> from fraccions import suma_reciprocs

---- inici

>>> nbrs = iter((4, 2, 3))
>>> f = suma_reciprocs(nbrs)
>>> f
Fraction(13, 12)

---- fi

>>> nbrs = iter((5, 4, 8, 3))
>>> f = suma_reciprocs(nbrs)
>>> f
Fraction(109, 120)

>>> nbrs = (4, 2, 3, 12, 5, 9, 23)
>>> f = suma_reciprocs(nbrs)
>>> f
Fraction(3149, 2070)

>>> nbrs = (7, 15, 4, 8, 2, 3, 12, 5, 9, 23)
>>> f = suma_reciprocs(nbrs)
>>> f
Fraction(107561, 57960)

>>> nbrs = [7, 15, 35, 4, 8, 41, 2, 3, 12, 64, 5, 9, 23, 37]
>>> f = suma_reciprocs(nbrs)
>>> f
Fraction(1372615217, 703402560)