Bài 1:Thực hiện phép tính
1.(\(\sqrt{28}_{ }-\sqrt{12}-\sqrt{7}\))\(\sqrt{7}\)+2\(\sqrt{21}\)
2. 2\(\sqrt{3}\) +\(\sqrt{27}\)-3\(\sqrt{45}\) +\(\sqrt{5}\)
3.(2\(\sqrt{2}\) -\(\sqrt{5}\)+\(\sqrt{18}\)).\(\sqrt{5}+20\sqrt{\frac{1}{10}}\)
4.\(\sqrt{27}-3\sqrt{48}+2\sqrt{75}-\sqrt{\left(2-\sqrt{3}\right)^2}\)
5.(\(\sqrt{8}-5\sqrt{2}+\sqrt{20}\)).\(\sqrt{5}\)+(40\(\sqrt{\frac{1}{10}}-10\)
6. \(\sqrt{2x}-3\sqrt{8x}+4\sqrt{18x}=14\)