а) 7/36 + 1/5 + 5/36 = 7/36 + 7/36 + 5/36 = 19/36 = 19/36
б) 19/42 - (5/42 + 1/5) = 19/42 - 7/42 = 12/42 = 2/7
в) (1/6 + 7/15) - 2/15 = 5/30 + 14/30 - 4/30 = 15/30 = 1/2
а) 7/36 + 1/5 + 5/36 = 7/36 + 7/36 + 5/36 = 19/36 = 19/36
б) 19/42 - (5/42 + 1/5) = 19/42 - 7/42 = 12/42 = 2/7
в) (1/6 + 7/15) - 2/15 = 5/30 + 14/30 - 4/30 = 15/30 = 1/2