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Simplify and express each of the follow...

Simplify and express each of the following as a rational number:
( i ) `(frac(3)(2))^(-3) xx (frac(3)(2))^(-2)`
( ii ) `(frac(3)(4))^(-2) xx (frac(5)(2))^(-3)`
( iii ) `(frac(-2)(3))^(-4) xx (frac(-3)(5))^(2)`

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