а) 3/8 + 5/8 = 8/8 = 1
б) 7/15 - 2/15 = 5/15 = 1/3
в) 1/7 + 3/7 + 2/7 = 6/7
г) 3/11 + 8/11 - 4/11 = 7/11
а) 3/8 + 5/8 = 8/8 = 1
б) 7/15 - 2/15 = 5/15 = 1/3
в) 1/7 + 3/7 + 2/7 = 6/7
г) 3/11 + 8/11 - 4/11 = 7/11