Thực hiện phép tính

1)($\sqrt{}$6 + $\sqrt{}$2 )$\sqrt{2-\sqrt{3}}$
2)($\sqrt{6 }$ -  $\sqrt{10}$)$\sqrt{4+\sqrt{15}}$
3) 2 +$\sqrt{17-4\sqrt{9+4\sqrt{5}}}$
4)$\sqrt{ \sqrt{2} +2\sqrt[]{3} + \sqrt{18-8\sqrt{2}}}$
5)$\sqrt{ 2 +2\sqrt{5} +\sqrt{13-\sqrt{48}}}$​
6) (5+2$\sqrt{6}$)(49-20$\sqrt{6}$)$\sqrt{5-2\sqrt{6}}$