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1. $125 {(\sqrt{5})}^{2 x} = 1$

Answer: Option B

Explanation:

= > 5^{3} (\sqrt{5})^{2 x} = 1 = > 5^{3} . 5^{2 x . \frac{1}{2}} = 1 = > 5^{3 + x} = 5 ° = > 3 + x = 0 .' . x = - 3

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