Выполните действия: а) 2 1/10 : 1 2/5 б) 4 1/2 : 5 1/4 в) 4 3/4 : 1/4 - 2 3/14 * 7

а) 2 целых 1/10 : 1 целую 2/5 = (2 * 10 + 1) / 10 : (1 * 5 + 2) / 5 = 21/10 : 7/5 = 21/10 * 5/7 = (21 * 5) / (10 * 7) = (3 * 1) / (2 * 1) = 3/2 = 1 целая 1/2; б) 4 целых 1/2 : 5 целую 1/4 = (4 * 2 + 1) / 2 : (5 * 4 + 1) / 4 = 9/2 : 21/4 = 9/2 * 4/21 = (9 * 4) / (2 * 21) = (3 * 2) / (7 * 1) = 6/7; в) 4 целых 3/4 : 1/4 - 2 целые 3/14 * 7 = (4 * 4 + 3) / 4 : 1/4 - (2 * 14 + 3) / 14 * 7 = 19/4 : 1/4 - 31/14 * 7 = 19/4 * 4/1 - 31/14 * 7 = (19 * 4) / (4 * 1) - (31 * 7) / 14 = (19 * 1) / (1 * 1) - (31 * 1) / 2 = 19/1 - 31/2 = 19 - 15 целых 1/2 = 18 целых 2/2 - 15 целых 1/2 = 3 целых 1/2