Simplify:
(81/16)^-3/4 x [(25/9)^-3/2 / (5/2)^-3)]
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(81/16)^-3/4×((25/9)^-3/2/(5/2)^-3))
=((3/2)^4)^-3/4×(((5/3)^2)^-3/2/(2/5)^3))
=2^3/3^3×((3^3/5^3/(8/125)))
=8/27(27/8)
=1
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