6 целых 3/4 : 9 + 24 : 6/7 - 1/9 : 4 /21 / 53 целых 2/3 -22 целых 14/15 : 2 целых 2/3

1) 6 3/4 : 9 = 27/4 : 9/1 = 27/4 * 1/9 = 3/4 * 1/1 = 3/4;2) 24 : 6/7 = 24/1 * 7/6 = 4/1 * 7/1 = 28/1 = 28;3) 1/9 : 4/21 = 1/9 * 21/4 = 1/3 * 7/4 = 7/12;4) 7/12 : 53 2/3 = 7/12 : 161/3 = 7/12 * 3/161 = 1/4 * 1/23 = 1/92;5) 22 14/15 : 2 2/3 = 344/15 : 8/3 = 344/15 * 3/8 = 43/5 * 1/1 = 43/5 = 8 3/5;6) 3/4 + 28 = 28 3/4;7) 28 3/4 - 1/92 = 28 69/92 - 1/92 = 28 68/92 = 28 34/46 = 28 17/23;8) 28 17/23 - 8 3/5 = 28 85/115 - 8 69/115 = 20 16/115.Ответ: 20 16/115.