1) по действиям:
1) 15/28 - 11/36 = 135/252 - 77/252 = 58/252 = 29/126
2) 29/126 * 21/29 = 21/126 = 1/6
3) 6 6/7 : 16/21 = 48/7 : 16/21 = 48/7 * 21/16 = 9
4)1/6 + 9 = 1/6 + 54/6 =55/6
5) 55/6 : 16 1/2 = 55/6 : 33/2 = 55/6 * 2/33 = 55/99 = 5/9
2) по действиям:
1) 4 5/7 - 1 11/14 = 33/7 - 25/14 = 66/14 - 25/14 = 41/14
2) 41/14 * 4 2/3 = 41/14 * 14/3 = 41/3
3) 3 2/9 - 1 5/6 = 29/9 - 11/6 = 58/18 - 33/18 = 25/18
4) 25/18*18/25 = 1
5) 41/3 + 1 = 41/3 + 3/3 = 44/3
6) 44/3 : 2 3/4 = 44/3 : 11/4 = 44/3 * 4/11 = 16/3 = 5 1/3
3) по действиям:
1) 53/56 - 29/35 = 265/280 - 232/280 = 33/280
2) 33/280 : 33/40 = 33/280 * 40/33 = 40/280 = 1/7
3) 7 5/7 : 3 3/5 = 54/7 : 18/5 = 54/7 * 5/18 = 15/7
4) 15/7 - 1/7 = 14/7 = 2
5) 1 9/40 * 2 = 49/40 * 2 = 49/20 = 2 9/20