Hướng dẫn trả lời:
`\sqrt{3/4}+\sqrt{1/3}+\sqrt{1/12}.`
`= \sqrt{3}/\sqrt{4} + \sqrt{1}/\sqrt{3} + \sqrt{1}/\sqrt{12}.`
`= \sqrt{3}/2 + \sqrt{1}/\sqrt{3} + \sqrt{1}/{2\sqrt{3}}.`
`= \sqrt{3}/2 + \sqrt{3}/\sqrt{3.3} + \sqrt{3}/{2\sqrt{3.3}}.`
`= \sqrt{3}/2 + \sqrt{3}/3 + \sqrt{3}/6.`
`= \sqrt{3}.(1/2 + 1/3 + 1/6).`
`= \sqrt{3}.1.`
`= \sqrt{3}.`