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Simplify and express each of the followi...

Simplify and express each of the following as power of a rational number: `(2/3)^3xx(-6/7)^2xx(-7/4)xx3/2` (iii)`-(2/5)^2xx(5/7)^2xx(49)/5+(-4/5)^3xx5/4xx3/4`

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