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Simplify each of the following and expre...

Simplify each of the following and express each as a rational number:
( i ) `(frac(2)(3))^(4) xx (frac(2)(3))^(2)`
( ii ) `(frac(-3)(4))^(3) xx (frac(-3)(4))^(2)`
( iii ) `(frac(5)(7))^(5) xx (frac(5)(7))^(-3)`
( iv ) `(frac(-3)(5))^(-3) xx (frac(-3)(5))^(2)`

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