а) 1/4 + 3/10 = 5/20 + 6/20 = 11/20б) 3/5 - 1/6 = 18/30 - 5/30 = 13/30в) 5/12 + 3/8 = 10/24 + 9/24 = 19/24г) 7/10 - 2/15 = 21/30 - 4/30 = 17/30
а) 1/4 + 3/10 = 5/20 + 6/20 = 11/20
б) 3/5 - 1/6 = 18/30 - 5/30 = 13/30
в) 5/12 + 3/8 = 10/24 + 9/24 = 19/24
г) 7/10 - 2/15 = 21/30 - 4/30 = 17/30