2/ \sqrt{2} + 2\sqrt{2}
źródło:
\frac{2}{\sqrt{2}}+2\sqrt{2}=\frac{2*\sqrt{2}}{\sqrt{2}*\sqrt{2}}+2\sqrt{2}=\frac{2\sqrt{2}}{2}+2\sqrt{2}=\sqrt{2}+2\sqrt{2}=3\sqrt{2}