а) 5/6 + 1/4 = 10/12 + 3/12 = 13/12 = 1 целая 1/12
б) 7/8 - 5/6 = 21/24 - 20/24 = 1/24
в) 3/10 - 4/15 = 9/30 - 8/30 = 1/30
г) 5 - 3 2/7 = 4 7/7 - 3 2/7 = 1 целая 5/7
д) 4/9 · 3/8 = (1·1)/(3·2) = 1/6
ж) 2 6/7 : 1 3/7 = 20/7 : 10/7 = 20/7 · 7/10 = 20/10 = 2
з) 6 3/5 · 10 = 6 · 10 + 3/5 · 10 = 60 + 30/5 = 60 + 6 = 66
а) 5/6 + 1/4 = 10/12 + 3/12 = 13/12 = 1 целая 1/12
б) 7/8 - 5/6 = 21/24 - 20/24 = 1/24
в) 3/10 - 4/15 = 9/30 - 8/30 = 1/30
г) 5 - 3 2/7 = 4 7/7 - 3 2/7 = 1 целая 5/7
д) 4/9 · 3/8 = (1·1)/(3·2) = 1/6
ж) 2 6/7 : 1 3/7 = 20/7 : 10/7 = 20/7 · 7/10 = 20/10 = 2
з) 6 3/5 · 10 = 6 · 10 + 3/5 · 10 = 60 + 30/5 = 60 + 6 = 66