\(\dfrac{1}{2}\sqrt{48}-2\sqrt{75}-\dfrac{\sqrt{33}}{\sqrt{11}}:5\sqrt{1\dfrac{1}{3}}\)
\(=\dfrac{1}{2}\sqrt{4^2.3}-2\sqrt{5^2.3}-\dfrac{\sqrt{3.11}}{\sqrt{11}}:5\sqrt{\dfrac{4}{3}}\)
\(=\dfrac{1}{2}.4\sqrt{3}-2.5\sqrt{3}-\sqrt{3}:\dfrac{10}{\sqrt{3}}\)
\(=2\sqrt{3}-10\sqrt{3}-\dfrac{\sqrt{3}.\sqrt{3}}{10}\)
\(=-8\sqrt{3}-\dfrac{3}{10}\)