Question : Let's see who can crack this: 5 - 4 = 23 8 - 1 =

Question : let's see who can crack this: 5 - 4 = 23 8 - 1 = 63 6 -16 = 32 9 - 9 = 78 3 - 9 = 6 3 - 81 = ? explain the logic.