To simplify the expression \(\frac{9\sqrt{33}}{27\sqrt{11}}\), we can follow these steps:
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Simplify the coefficients (the numbers outside the square roots): \[ \frac{9}{27} = \frac{1}{3} \]
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Simplify the square roots: \[ \frac{\sqrt{33}}{\sqrt{11}} = \sqrt{\frac{33}{11}} = \sqrt{3} \]
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Combine the simplified parts: \[ \frac{9\sqrt{33}}{27\sqrt{11}} = \frac{1}{3}\sqrt{3} \]
Thus, the exact answer is: \[ \frac{\sqrt{3}}{3} \]