Giải thích các bước giải:

$c/ \sqrt{9} - \dfrac{2}{\sqrt{2} - 1} + \dfrac{3}{\sqrt{2}}$

$= 3 - \dfrac{2(\sqrt{2} + 1)}{(\sqrt{2} - 1)(\sqrt{2} + 1)} + \dfrac{3\sqrt{2}}{2}$

$= 3 - \dfrac{2\sqrt{2} + 2}{2 - 1} + \dfrac{3\sqrt{2}}{2}$

$= 3 - (2\sqrt{2} + 2) + \dfrac{3\sqrt{2}}{2}$

$= 3 - 2\sqrt{2} - 2 + \dfrac{3\sqrt{2}}{2}$

$= (3 - 2) + (-2\sqrt{2} + \dfrac{3\sqrt{2}}{2})$

$= 1 - \dfrac{\sqrt{2}}{2}$