272/3 = (271/3)2 = 32 = 9
and
642/3 = (641/3)2 = 42 = 16
So
(27/64)2/3 = 9/16
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27 is 3 to the 3rd power, and 64 is 2 to the 6th power, so the only number that goes into both evenly is one (1).
A number to a negative power is just moved to the denominator: (27^-1)/2 = 1/ (27^1)*2=1/(27*2)=1/54
2 x 2 x 2 x 2 x 2 x 2 x 2 x 2= 256
10
66