C) \(\left(\frac{\sqrt{6}-\sqrt{2}}{1-\sqrt{3}}-\frac{5}{\sqrt{5}}\right) : \frac{\sqrt{5}+\sqrt{2}}{3}\) d) \(\frac{\sqrt{15}-\sqrt{20}}{\sqrt{3}-2} + \frac{4}{2-\sqrt{5}}\)