а) 1/4 + 3/7 = (7/28) + (12/28) = 19/28б) 1/2 - 3/8 = (4/8) - (3/8) = 1/8в) 3/5 + (1.2 - 0.1) = 3/5 + 1.1 = 3/5 + 11/10 = 6/10 + 11/10 = 17/10 = 1.7
а) 1/4 + 3/7 = (7/28) + (12/28) = 19/28
б) 1/2 - 3/8 = (4/8) - (3/8) = 1/8
в) 3/5 + (1.2 - 0.1) = 3/5 + 1.1 = 3/5 + 11/10 = 6/10 + 11/10 = 17/10 = 1.7