Đáp án+Giải thích các bước giải:
`c)sqrt{4-2sqrt3}`
`=sqrt{3-2sqrt3+1}`
`=sqrt{(sqrt3-1)^2}`
`=|sqrt3-1|`
`=sqrt3-1`
`d)sqrt{6+2sqrt5}`
`=sqrt{5+2sqrt5+1}`
`=sqrt{(sqrt5+1)^2}`
`=|sqrt5+1|`
`=sqrt5+1`
`f)sqrt{(sqrt{11}-4)^2}+sqrt{(sqrt{11}+4)^2}`
`=|sqrt{11}-4|+|sqrt{11}+4|`
`=|sqrt{11}-sqrt{16}|+4+sqrt{11}`
`=4-sqrt{11}+4+sqrt{11}`
`=8`
`h)(sqrt5-sqrt3)/(sqrt5+sqrt3)+(sqrt5+sqrt3)/(sqrt5-sqrt3)`
`=(sqrt5-sqrt3)^2/((sqrt5+sqrt3)(sqrt5-sqrt3))+(sqrt5+sqrt3)^2/((sqrt5+sqrt3)(sqrt5-sqrt3))`
`=((sqrt5-sqrt3)^2+(sqrt5+sqrt3)^2)/(5-3)`
`=(5-2sqrt{15}+3+5+2sqrt{15}+3)/2`
`=(5+3+5+3)/2`
`=16/2=8`
