Đáp án+Giải thích các bước giải:
`1)(\sqrt{2}-1)^2`
`=2-2\sqrt{2}+1`
`=3-2\sqrt{2}`
`2)(\sqrt{3}+1)^2`
`=3+2\sqrt{3}+1`
`=4+2\sqrt{3}`
`3)(\sqrt{2}-\sqrt{3})^2`
`=2-2.\sqrt{2}.\sqrt{3}+3`
`=5-2\sqrt{6}`
`4)(2\sqrt{2}+\sqrt{3})^2`
`=(2\sqrt{2})^2+2.2\sqrt{2}.\sqrt{3}+(\sqrt{3})^2`
`=8+4\sqrt{6}+3`
`=11+4\sqrt{6}`
`5)(2\sqrt{5}-3\sqrt{3})^2`
`=(2\sqrt{5})^2-2.2\sqrt{5}.3\sqrt{3}+(3\sqrt{3})^2`
`=20-12\sqrt{15}+27`
`=47-12\sqrt{15}`
