Ответы и объяснения

2014-03-04T10:30:33+00:00
7/8-5/6 = 21/24-20/24 = 1/24.
6/7-3/10 = 60/70-21/70 = 49/70 = 7/10.
5/6-2/3 = 5/6-4/6 = 1/6.
1/4-1/5 = 5/20-4/20 = 1/20.
17/18-5/6 = 17/18- 15/18 = 3/18 = 1/6.
7/9-1/4 = 28/36- 9-36 = 19/36