Philip P. answered 01/25/15
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It helps to know that 125 = 53 and 8 = 23:
- (1/125)2/3 = ((1/5)3)2/3 = (1/5)2 = 1/25
- 8-4/3 = (23)-4/3 = 2-4 = 1/24 = 1/16