tính
1) \(\dfrac{1}{50}\sqrt{50}-2\sqrt{96}-\dfrac{\sqrt{30}}{\sqrt{15}}+12\sqrt{\dfrac{1}{6}}\)
2) \((\dfrac{5-\sqrt{5}}{\sqrt{5}}-2)(\dfrac{4}{1+\sqrt{5}}+4)\)
3) \(\sqrt{4-\sqrt{15}}-\sqrt{4+\sqrt{15}}+\sqrt{6}\)
4) \(\sqrt{3+2\sqrt{2}}+\sqrt{(\sqrt{2}-2)^2}\)
5) \(3\sqrt{2x}-5\sqrt{8x}+7\sqrt{18x}\)
6) \((2\sqrt{3}+4)(\sqrt{3}-2)\)
1, -6\(\sqrt{6}\)
2, -4
3, 0
4, 3
6, -2