a) 1 7/9 : 2 2/3 = 16/9 : 8/3 = 16/9 * 3/8 = 2/3
б) 3 3/5 : 2 1/10 = 18/5 : 21/10 = 18/5 * 10/21 = 12/7
в) 3 3/8 : 1/8 - 1 5/14 * 7 = 27/8 : 1/8 - 19/14 * 7 = 27 - 19/2 = 54/2 - 19/2 = 35/2