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\frac{3\sqrt{3}}{3\sqrt{3}}
Factor 27=3^{2}\times 3. Rewrite the square root of the product \sqrt{3^{2}\times 3} as the product of square roots \sqrt{3^{2}}\sqrt{3}. Take the square root of 3^{2}.
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Cancel out 3\sqrt{3} in both numerator and denominator.
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