

Tính :
[tex]\frac{2+\sqrt{5}}{\sqrt{2}+\sqrt{3+\sqrt{5}}}[/tex] + [tex]\frac{2-\sqrt{5}}{\sqrt{2}+\sqrt{3-\sqrt{5}}}[/tex]
[tex]\frac{2+\sqrt{5}}{\sqrt{2}+\sqrt{3+\sqrt{5}}}[/tex] + [tex]\frac{2-\sqrt{5}}{\sqrt{2}+\sqrt{3-\sqrt{5}}}[/tex]
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