1) 16 : 1 1/3 = 16 : 4/3 = 16 * 3/4 = 12
2) 2 3/4 : 11 = 11/4 : 11 = 11/4 * 1/11 = 1/4
3) 12 - 4 5/9 = 12 - 41/9 = 108/9 - 41/9 = 67/9 = 7 4/9
4) 7 4/9 + 1/4 = 67/9 + 1/4 =268/36 + 9/36 = 277/36 = 7 25/36
5) 7 25/36 + 3 1/4 = 277/36 + 13/4 =277/36 + 117/36 = 394/36 = 197/18 = 10 17/18
6) 7 1/3 - 6 5/9 = 22/3 - 59/9 =66/9 - 59/9 = 7/9
7) 7/9 × 5/28 = 5/36
8)10 17/18 : 5/36 = 197/18 : 5/36 = 197/18 * 36/5 = 394/5 = 78 4/5
ответ 78 4/5