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1. \(\dfrac{8-2\sqrt{7}}{\sqrt{7}-1}=\dfrac{7-2\sqrt{7}+1}{\sqrt{7}-1}=\) [ ];

2. \(\dfrac{9+4\sqrt{5}}{2+\sqrt{5}}=\) [ ];

3. \(\dfrac{11-2\sqrt{30}}{\sqrt{6}-\sqrt{5}}=\dfrac{6+5-2\sqrt{6}\cdot \sqrt{5}}{\sqrt{6}-\sqrt{5}}=\) [ ];

4. \(\dfrac{\sqrt{3}+\sqrt{2}}{5+2\sqrt{6}}=\) [ ].