`1`/ `sqrt{27 - 10\sqrt{2}}`
`= sqrt{5² - 2.5.\sqrt{2} + (\sqrt{2})²}`
`= sqrt{(5 - \sqrt{2})²}`
`= |5 - sqrt{2}|`
`= 5 - sqrt{2}`
`2`/ `sqrt{46 - 6\sqrt{5}}`
`= sqrt{(3√5 - 1)²}`
`= 3√5 - 1`
`3`/ `sqrt{(7 + √24)²}`
`= sqrt{(√6 + 1)²}`
`= √6 + 1`
`4` / `sqrt{6 - \sqrt{35}}`
`= sqrt{\frac{2(6 - \sqrt{35})}{2}}`
`= sqrt{\frac{(√7 - √5)²}{2}`
`= (\sqrt{14} - \sqrt{10})/(2)`
`5`/ `sqrt{2x - 1 + 2\sqrt{(x + 2)(x - 3)}}` `(ĐKXĐ: x ne -2; x ne 3)`
`= sqrt{(\sqrt{x + 2} + \sqrt{x - 3})²}`
`= sqrt{x + 2} + sqrt{x - 3}`
