16, \(5\sqrt{3}:\sqrt{15}\)
\(=5\sqrt{3}:\sqrt{5}\cdot\sqrt{3}\)
\(=\dfrac{5\sqrt{3}}{\sqrt{5}\cdot\sqrt{3}}\)
\(=\dfrac{5}{\sqrt{5}}\)
\(=\dfrac{\sqrt{5}\cdot\sqrt{5}}{\sqrt{5}}\)
\(=\sqrt{5}\)
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