8 пример видно не до конца!
5)5/22-7/66/5/12+33/44=30/132-14/132-55/132+99/132=360/132=5/11
6)7 4/9-11 5/6+8 5/18-3 11/27=7 24/54-11 45/54+ 8 15/54-3 22/54=15 39/54-14 67/54=15 93/54-14 67/54=26/54=13/27
7) 9/16-5/12+19/24-8=27/48-20/48+38/48-8=65/48-8 20/48=1 17/48-8 20/48=-7 3/48=-7 1/16