Giải các phương trình sau

$$\begin{gathered} 1.\sqrt{8-2\sqrt{15}}+\sqrt{8+2\sqrt{15}} \\ 2.\sqrt{17-12\sqrt{2}}+\sqrt{17+12\sqrt{2}} \\ 3.\sqrt{6-\sqrt{35}}+\sqrt{6+\sqrt{35}} \\ 4.\sqrt{33-20\sqrt{2}}+\sqrt{33+20\sqrt{2}} \\ 5.\sqrt{25+4\sqrt{10}+4+4\sqrt{15}+4\sqrt{6}} \\ 6.\sqrt{0,25\sqrt{961}+2\sqrt{10}+\sqrt{15}+\sqrt{6}} \\ 7.\sqrt{6+a+6\sqrt{a-3}}+\sqrt{6+a-6\sqrt{a-3}} \\ 8.(\sqrt{3}+\sqrt{5})(\sqrt{7}-2\sqrt{20}) \\ 9.\sqrt{5}-\sqrt{3-\sqrt{29-12\sqrt{5}}} \\ 10.\sqrt{6+2\sqrt{2}*\sqrt{3-\sqrt{4+2\sqrt{3}}}} \end{gathered}$$