Đáp án+Giải thích các bước giải:
`29)`
`\sqrt{2-\sqrt{3}}`
`=(\sqrt{2}.(\sqrt{2-\sqrt{3}}))/(\sqrt{2})`
`=\sqrt{4-2\sqrt{3}}/(\sqrt{2})`
`=\sqrt{3-2\sqrt{3}+1}/(\sqrt{2})`
`=\sqrt{(\sqrt{3}-1)^2}/(\sqrt{2})`
`=(|\sqrt{3}-1|)/(\sqrt{2})`
`=(\sqrt{3}-1)/(\sqrt{2})(Vì:\sqrt{3}>1)`
`30)`
`\sqrt{6-\sqrt{35}}`
`=(\sqrt{2}.(\sqrt{6-\sqrt{35}}))/(\sqrt{2})`
`=\sqrt{12-2\sqrt{35}}/(\sqrt{2})`
`=\sqrt{7-2\sqrt{7}.\sqrt{5}+5}/(\sqrt{2})`
`=\sqrt{(\sqrt{7}-\sqrt{5})^2}/(\sqrt{2})`
`=(|\sqrt{7}-\sqrt{5}|)/(\sqrt{2})`
`=(\sqrt{7}-\sqrt{5})/(\sqrt{2})(Vì:\sqrt{7}>\sqrt{5})`
