Разные действия с дробЯми 1/2-4/45+13/15
1/2 - 4/45 +13/15 = 45-8+78 /90=115/90=23/18
1/2-4/45+13/15 = 37/90 + 13/15 = 23/18 = 1 5/18; 1) 1/2 - 4/45 = 45/90 - 8/90 = 37/90 2) 37/90 + 13/15 = 37/90 + 78/90 = 115/90 = 23/18