a) 1/3 + 3/8 = 8/24 + 9/24 = 17/24б) 5/12 - 1/30 = 25/60 - 2/60 = 23/60в) 19/30 - 0.3 + 9/20 = 19/30 - 3/10 + 27/60 = 38/60 - 18/60 + 27/60 = 47/60
a) 1/3 + 3/8 = 8/24 + 9/24 = 17/24
б) 5/12 - 1/30 = 25/60 - 2/60 = 23/60
в) 19/30 - 0.3 + 9/20 = 19/30 - 3/10 + 27/60 = 38/60 - 18/60 + 27/60 = 47/60