Question

Racionalize os denominadores

Answer 1

$\tt a)~\sf\dfrac{5}{\sqrt{5}}=\dfrac{5\sqrt{5}}{5}=\sqrt{5}\\\tt b)~\sf\dfrac{3}{3\sqrt{5}}=\dfrac{1}{\sqrt{5}}=\dfrac{\sqrt{5}}{5}\\\tt c)~\sf\dfrac{3\sqrt{5}}{5\sqrt{5}}=\dfrac{3}{5}$