giúp mik với, hứa vote 5 sao
1) $\sqrt{4+\sqrt{10+2\sqrt{5}}}$+$\sqrt{4-\sqrt{10+2\sqrt{5}}}$
2) $\frac{2+\sqrt{3}}{\sqrt{2}+\sqrt{2+\sqrt{3}}}$+$\frac{2-\sqrt{3}}{\sqrt{2}-\sqrt{2-\sqrt{3}}}$
3) A=$\sqrt[3]{2+\sqrt{5}}$+$\sqrt[3]{2-\sqrt{5}}$
4) N=$\sqrt[3]{5\sqrt{2}+7}$-$\sqrt[3]{5\sqrt{2}-7}$