2 câu trả lời
a) `\sqrt{(1-\sqrt{2})^2}+\sqrt{11-6\sqrt{2}}`
`=\sqrt{(\sqrt{2}-1)^2}+\sqrt{(9-6\sqrt{2}+2}`
`=|\sqrt{2}-1|+\sqrt{(3-\sqrt{2})^2}`
`=\sqrt{2]-1+|3-\sqrt{2}|`
`=\sqrt{2}-1+3-\sqrt{2}`
`=2`
b) `\sqrt{17+12\sqrt{2}}-(1-2\sqrt{2})^2`
`=\sqrt{9+12\sqrt{2}+8}-(1-4\sqrt{2}+8)`
`=\sqrt{(3+2\sqrt{2})^2}-1+4\sqrt{2}-8`
`=|3+2\sqrt{2}|-9+4\sqrt{2}`
`=3+2\sqrt{2}-9+4\sqrt{2}`
`=6\sqrt{2}-6`
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