đề ko rõ ràng lắm nên mik lm 2 cái nha :33
`\sqrt{12}+\sqrt{3}(\sqrt{27}-\sqrt{3})`
`=2\sqrt{3}+\sqrt{3}(3\sqrt{3}-\sqrt{3})`
`=2\sqrt{3}+\sqrt{3}.2\sqrt{3}`
`=2.3+2\sqrt{3}`
`=6+2\sqrt{3}`
`\sqrt{12}+\sqrt{3}.\sqrt{27}-\sqrt{3}`
`=2\sqrt{3}+\sqrt{3}.3\sqrt{3}-\sqrt{3}`
`=\sqrt{3}+3.3`
`=9+\sqrt{3}`