а) 3/5 + 4/5 = 8/5 = 1 3/5
б) 9/12 + 14/12 = 23/12 = 1 11/12
в) 7/8 + 5/8 = 12/8 = 1 4/8 = 1 1/2
г) 13/25 + 14/25 = 27/25 = 1 2/25
д) 13/19+11/19+7/19= 31/19 = 1 12/19
а) 3/5 + 4/5 = 8/5 = 1 3/5
б) 9/12 + 14/12 = 23/12 = 1 11/12
в) 7/8 + 5/8 = 12/8 = 1 4/8 = 1 1/2
г) 13/25 + 14/25 = 27/25 = 1 2/25
д) 13/19+11/19+7/19= 31/19 = 1 12/19