5^2×√(5&5^3 )/√5×√(10&5^7

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5^2×√(5&5^3 )/√5×√(10&5^7

5^2×√(5^3 )/[√5×√(5^7 )]
=5^2x5^3/2/[5^1/2x5^7/2]
=5^5/5^4
=5