Question

raiz de 2 menos 1 sobre 2 menos raiz de 2

Answer 1

Temos que:

$\dfrac{\sqrt{2}-1}{2-\sqrt{2}}=\dfrac{\sqrt{2}-1}{2-\sqrt{2}}.\dfrac{2+\sqrt{2}}{2+\sqrt{2}}=$
$\dfrac{\sqrt{2}}{4-2}=\dfrac{\sqrt{2}}{2}$