Tính
----- Nội dung ảnh -----
```
9) \((\sqrt{3}+3)(2-\sqrt{3});\)
11) \((\sqrt{2}-1)(3+\sqrt{8});\)
13) \((2\sqrt{5}-5)(1+\sqrt{5})+3\sqrt{5};\)
15) \((\sqrt{7}-3)(\sqrt{7}+3)-\sqrt{5-\sqrt{2}};\)
17) \((\sqrt{7}+2\sqrt{12}-\sqrt{5}-2\sqrt{12})^2;\)
18) \(\sqrt{5+2\sqrt{6}-\sqrt{5-2\sqrt{6}}}^2\)
```
```
9) \((\sqrt{3}+3)(2-\sqrt{3});\)
11) \((\sqrt{2}-1)(3+\sqrt{8});\)
13) \((2\sqrt{5}-5)(1+\sqrt{5})+3\sqrt{5};\)
15) \((\sqrt{7}-3)(\sqrt{7}+3)-\sqrt{5-\sqrt{2}};\)
17) \((\sqrt{7}+2\sqrt{12}-\sqrt{5}-2\sqrt{12})^2;\)
18) \(\sqrt{5+2\sqrt{6}-\sqrt{5-2\sqrt{6}}}^2\)
```