[tex] \frac{a}{ \sqrt{11} } = \frac{a \times \sqrt{11} }{ \sqrt{11} \times \sqrt{11} } = \frac{a \sqrt{11} }{11} \\ \frac{18}{ \sqrt{6} } = \frac{18 \sqrt{6} }{ \sqrt{6} \times \sqrt{6} } = \frac{18 \sqrt{6} }{6} = 3 \sqrt{6} \\ \frac{5}{ \sqrt{10} } = \frac{5 \sqrt{10} }{ \sqrt{10} \times \sqrt{10} } = \frac{5 \sqrt{10} }{10} = \frac{ \sqrt{10} }{2} \\ \frac{13}{ \sqrt{26} } = \frac{13 \sqrt{26} }{ \sqrt{26} \times \sqrt{26} } = \frac{13 \sqrt{26} }{26} = \frac{ \sqrt{26} }{2} [/tex]
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[tex] \frac{a}{ \sqrt{11} } = \frac{a \times \sqrt{11} }{ \sqrt{11} \times \sqrt{11} } = \frac{a \sqrt{11} }{11} \\ \frac{18}{ \sqrt{6} } = \frac{18 \sqrt{6} }{ \sqrt{6} \times \sqrt{6} } = \frac{18 \sqrt{6} }{6} = 3 \sqrt{6} \\ \frac{5}{ \sqrt{10} } = \frac{5 \sqrt{10} }{ \sqrt{10} \times \sqrt{10} } = \frac{5 \sqrt{10} }{10} = \frac{ \sqrt{10} }{2} \\ \frac{13}{ \sqrt{26} } = \frac{13 \sqrt{26} }{ \sqrt{26} \times \sqrt{26} } = \frac{13 \sqrt{26} }{26} = \frac{ \sqrt{26} }{2} [/tex]