1 целая 3/7 2 целые 4/5 = (1 + 3/7) (2 + 4/5) = (10/7) * (14/5) = 140/35 = 4
9/14 5/12 = (9/14) (5/12) = 45/168 = 5/18
1 целая 3/7 2 целые 4/5 = (1 + 3/7) (2 + 4/5) = (10/7) * (14/5) = 140/35 = 4
9/14 5/12 = (9/14) (5/12) = 45/168 = 5/18