Rút gọn biểu thức sau
giải gúp em câu 10 đến câu 13 đi ạ
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9) \( A = \left( \frac{1}{\sqrt{x-2} - \sqrt{x-4}} \right) \cdot \left( \frac{1}{\sqrt{x+2}} \right) \)
10) \( A = \frac{5 - 5\sqrt{x}}{x - 16} - \frac{2}{4 - \sqrt{x}} + \frac{3}{\sqrt{x + 4}} \)
11) \( A = \frac{\sqrt{x+3}}{\sqrt{x+1}} + \frac{5}{\sqrt{x-1}} + \frac{4}{x-1} \)
12) \( A = \frac{\sqrt{x}}{2\sqrt{x-3}} + \frac{\sqrt{x-2}}{2\sqrt{x+3}} + \frac{15 - 4\sqrt{x}}{9 - 4x} \)
13) \( A = \left( \frac{1}{\sqrt{x-1} + \sqrt{x-1}} \right) \cdot \left( \frac{4\sqrt{x-4}}{2\sqrt{x}+1} \right) \)
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9) \( A = \left( \frac{1}{\sqrt{x-2} - \sqrt{x-4}} \right) \cdot \left( \frac{1}{\sqrt{x+2}} \right) \)
10) \( A = \frac{5 - 5\sqrt{x}}{x - 16} - \frac{2}{4 - \sqrt{x}} + \frac{3}{\sqrt{x + 4}} \)
11) \( A = \frac{\sqrt{x+3}}{\sqrt{x+1}} + \frac{5}{\sqrt{x-1}} + \frac{4}{x-1} \)
12) \( A = \frac{\sqrt{x}}{2\sqrt{x-3}} + \frac{\sqrt{x-2}}{2\sqrt{x+3}} + \frac{15 - 4\sqrt{x}}{9 - 4x} \)
13) \( A = \left( \frac{1}{\sqrt{x-1} + \sqrt{x-1}} \right) \cdot \left( \frac{4\sqrt{x-4}}{2\sqrt{x}+1} \right) \)