Question

Racionalizar 20 sobre 2 raiz de 5

Answer 1

$\dfrac{20}{2 \sqrt{5} } \\ \\ \\ \dfrac{20.2 \sqrt{5}}{(2 \sqrt{5}) .(2 \sqrt{5})} \\ \\ \\ \dfrac{40\sqrt{5}}{(2 \sqrt{5})^2} \\ \\ \\ \dfrac{40\sqrt{5}}{2^2 (\not\sqrt{5})^\not2} \\ \\ \\ \dfrac{40\sqrt{5}}{4. 5} \\ \\ \\ \dfrac{40\sqrt{5}}{20} \\ \\ \\ =\ \textgreater \ 2 \sqrt{5}$