Đáp án:

Giải thích các bước giải:

`o) sqrt{(289+4sqrt{72})/16}`

` = sqrt{(289 + 2sqrt{288})/sqrt{4^2} `

` = sqrt{(sqrt{288} + 1)^2}/4 `

` = (|sqrt{288}+1|)/4 `

` = (sqrt{288}+1)/4 `

`q) sqrt{2} . sqrt{7-3sqrt{5}}`

` = sqrt{14 - 6sqrt{5}}`

` = sqrt{(3-sqrt{5})^2} `

`= | 3 - sqrt{5} | `

`=  3 - sqrt{5} `

`u) sqrt{ 59/25 + 6/5sqrt{2}}`

`= sqrt{59/25 + (30sqrt{2})/25} `

` = sqrt{(59+30sqrt{2})/25} `

`= sqrt{(5sqrt{2}+3)^2}/sqrt{5^2} `

` = (|5sqrt{2}+3|)/5 `

`= (5sqrt{2}+3)/5 `