Rút gọn biểu thức sau
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6) A = \(\frac{1}{5+2\sqrt{3}} + \frac{1}{5-2\sqrt{3}}\)
8) A = \(\frac{5-2\sqrt{5}}{\sqrt{5-2}} - \sqrt{6-2\sqrt{5}}\)
10) A = \(\frac{\sqrt{35-\sqrt{7}} + 12}{\sqrt{5-1}} + \frac{1}{\sqrt{7-1}}\)
12) A = \(\frac{27-3\sqrt{2}}{\sqrt{3-\sqrt{2}}} - 6\frac{1}{3+\sqrt{3}}\)
14) A = \(\frac{\sqrt{6-\sqrt{3}}}{\sqrt{2}-1} - \sqrt{(1-\sqrt{3})^2}\)
16) A = \(\frac{5+2\sqrt{5}}{\sqrt{5}} + \sqrt{(3-\sqrt{5})^2}\)
18)
6) A = \(\frac{1}{5+2\sqrt{3}} + \frac{1}{5-2\sqrt{3}}\)
8) A = \(\frac{5-2\sqrt{5}}{\sqrt{5-2}} - \sqrt{6-2\sqrt{5}}\)
10) A = \(\frac{\sqrt{35-\sqrt{7}} + 12}{\sqrt{5-1}} + \frac{1}{\sqrt{7-1}}\)
12) A = \(\frac{27-3\sqrt{2}}{\sqrt{3-\sqrt{2}}} - 6\frac{1}{3+\sqrt{3}}\)
14) A = \(\frac{\sqrt{6-\sqrt{3}}}{\sqrt{2}-1} - \sqrt{(1-\sqrt{3})^2}\)
16) A = \(\frac{5+2\sqrt{5}}{\sqrt{5}} + \sqrt{(3-\sqrt{5})^2}\)
18)