5/9 - 1/6 = 10/18 - 3/18 = 7/185/8 - 3/4 = 10/16 - 12/16 = -2/16 = -1/84/7 14/15 = 56/105 = 8/1520/27 : 5/6 = 20/27 6/5 = 120/135 = 8/9(2/3)^3 = (8/27)
5/9 - 1/6 = 10/18 - 3/18 = 7/18
5/8 - 3/4 = 10/16 - 12/16 = -2/16 = -1/8
4/7 14/15 = 56/105 = 8/15
20/27 : 5/6 = 20/27 6/5 = 120/135 = 8/9
(2/3)^3 = (8/27)