[tex] \frac{1}{\sqrt{3}}=\frac{\sqrt{3}}{3}
[/tex]
[tex] \frac{2}{\sqrt{5}}=\frac{2*\sqrt{5}}{5}
[/tex]
[tex] \frac{3}{\sqrt{7}}=\frac{3*\sqrt{7}}{7}
[/tex]
[tex] \frac{\sqrt{2}}{\sqrt{5}}=\frac{\sqrt{10}}{5}
[/tex]
[tex] \frac{2*\sqrt{5}}{\sqrt{7}}=\frac{2*\sqrt{35}}{7}
[/tex]