Rút gọn căn thức

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1) \( A = \sqrt{6 - 2\sqrt{5}} + \sqrt{9 - 4\sqrt{5}} \)

2) \( A = \sqrt{4 - 2\sqrt{3}} + \sqrt{4 + 2\sqrt{3}} \)

3) \( A = \sqrt{7 - 4\sqrt{3}} - \sqrt{4 - 2\sqrt{3}} \)

4) \( A = \sqrt{4 + 2\sqrt{3}} - \sqrt{4 - 2\sqrt{3}} \)

5) \( A = \sqrt{7 - 2\sqrt{6}} - \sqrt{7 + 2\sqrt{6}} \)

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

7) \( A = \sqrt{11 + 6\sqrt{2}} - \sqrt{11 - 6\sqrt{2}} \)

8) \( A = \sqrt{8 - 2\sqrt{7}} \)

9) \( A = \sqrt{18 + 8\sqrt{2}} - \sqrt{18 - 8\sqrt{2}} \)

10) \( A = \sqrt{28 + 10\sqrt{3}} + \sqrt{19 - 8\sqrt{3}} \)