Tính: 49) \( A = \sqrt{5} - \frac{8}{\sqrt{5}+1} + \frac{2\sqrt{5} - 5}{2 - \sqrt{5}} \), 50) \( A = \frac{\sqrt{6} - \sqrt{3}}{\sqrt{2} - 1} - \sqrt{(1 - \sqrt{3})^2} \)

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49) \( A = \sqrt{5} - \frac{8}{\sqrt{5}+1} + \frac{2\sqrt{5} - 5}{2 - \sqrt{5}} \)

50) \( A = \frac{\sqrt{6} - \sqrt{3}}{\sqrt{2} - 1} - \sqrt{(1 - \sqrt{3})^2} \)

51) \( A = \frac{1}{2 + \sqrt{3}} + \frac{\sqrt{2}}{\sqrt{6}} - \frac{2}{3 + \sqrt{3}} \)

52) \( A = \frac{2}{\sqrt{6} - 2} + \frac{2}{\sqrt{6} + 2} + \frac{5}{\sqrt{6}} \)