Đáp án+Giải thích các bước giải:
`A = 2\sqrt{8} - \frac{2}{3}\sqrt{18} + \sqrt{50}`
`= 2\sqrt{4.2} - \frac{2}{3}\sqrt{9.2} + \sqrt{25.2}`
`= 4\sqrt{2} - 2\sqrt{2} + 5\sqrt{2}`
`= 7\sqrt{2}`
`B = \frac{3 + \sqrt{3}}{\sqrt{3}} - \frac{2}{\sqrt{3} - 1}`
`= \frac{\sqrt{3}(\sqrt{3} + 1)}{\sqrt{3}} - \frac{2(\sqrt{3} + 1)}{(\sqrt{3} - 1)(\sqrt{3} + 1)}`
`= \sqrt{3} + 1 - \frac{2(\sqrt{3} - 1)}{2}`
`= \sqrt{3} + 1 - \sqrt{3} + 1`
`= 2`