Tính:
1) \(\left(\sqrt{45}-\sqrt{20}+\sqrt{5}\right):\sqrt{6}\)
2) \(\frac{\sqrt{10}-\sqrt{15}}{\sqrt{8}-\sqrt{12}}\)
3) \(\frac{1}{3+\sqrt{2}}+\frac{1}{3-\sqrt{2}}\)
4) \(\sqrt{3}\left(\sqrt{12}+\sqrt{27}-\sqrt{3}\right)\)
5) \(\sqrt{144}-\sqrt{25}.\sqrt{4}\)
6) \(\frac{1}{\sqrt{3}-1}-\sqrt{3}+1\)