747.
54/9 = 6
56/8 = 7
36/12 = 3
45/5 = 9
72/12 = 6
51/17 = 3
748.
17 5/8 < 18
7 4/5 < 7 7/8 = 39/5 и 63/8 = 312/8 и 315/8, 312 < 315<br>8 > 66/9 , т.к. 66/9 = 7 3/9 , 8 > 7
38/5 < 7 4/5 = 38/5 и 39/5, 39 > 38
6 5/9 < 6 4/7, 59/9 и 46/7 = 413/63 и 414/63, 413 < 414
19 > 18 1/25