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EXAMPLE 12. Simplify: (2^(-1)div5^(-1))^...

EXAMPLE 12. Simplify: `(2^(-1)div5^(-1))^(2) xx (frac(-5)(8))^(-1)`

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The correct Answer is:
`-10`
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(frac(-1)(5))^(3) div (frac(-1)(5))^(8)= ?