Đáp án+Giải thích các bước giải:
c,
`\sqrt{4-2\sqrt{3}}+\sqrt{4+2\sqrt{3}}`
`=\sqrt{3-2\sqrt{3}.1+1}+\sqrt{3+2\sqrt{3}.1+1}`
`=\sqrt{(\sqrt{3}-1)^2}+\sqrt{(\sqrt{3}+1)^2}`
`=|\sqrt{3}-1|+|\sqrt{3}+1|`
`=\sqrt{3}-1+\sqrt{3}+1`
`=2\sqrt{3}`
f,
`\sqrt{6-4\sqrt{2}}+\sqrt{22-12\sqrt{2}}`
`=\sqrt{4-2.2.\sqrt{2}+2}+\sqrt{18-2.3\sqrt{2}.2+4}`
`=\sqrt{(2-\sqrt{2})^2}+\sqrt{(3\sqrt{2}-2)^2}`
`=|2-\sqrt{2}|+|3\sqrt{2}-2|`
`=2-\sqrt{2}+3\sqrt{2}-2`
`=2\sqrt{2}`
