a) 1/9 + 2/3 = 1/9 + 6/9 = 7/9
б) 2 целых 3/4 + 1/5 = 2 + 3/4 + 1/5 = 2 + 15/20 + 4/20 = 2 целых 19/20
в) 7/8 - 1/3 = 7/8 - 3/8 = 4/8 = 1/2
г) 1 целая 5/7 - 4/5 = 1 - 20/7 - 4/5 = 1 - 100/35 - 28/35 = 1 целая -128/35 = 1 целая -3 13/35
a) 1/9 + 2/3 = 1/9 + 6/9 = 7/9
б) 2 целых 3/4 + 1/5 = 2 + 3/4 + 1/5 = 2 + 15/20 + 4/20 = 2 целых 19/20
в) 7/8 - 1/3 = 7/8 - 3/8 = 4/8 = 1/2
г) 1 целая 5/7 - 4/5 = 1 - 20/7 - 4/5 = 1 - 100/35 - 28/35 = 1 целая -128/35 = 1 целая -3 13/35