Đáp án:
Giải thích các bước giải:
`b)B=sqrt{(5-2sqrt6)(4-2sqrt3)}`
`=sqrt{(3-2sqrt{3.2}+2)(3-2sqrt3+1)}`
`=sqrt{(sqrt3-sqrt2)^2(sqrt3-1)^2}`
`=(sqrt3-sqrt2)(sqrt3-1)`
`=3-sqrt3-sqrt6+sqrt2`
`d)D=sqrt{3-sqrt5}(3+sqrt5)(sqrt{10}-sqrt2)`
`=sqrt2sqrt{3-sqrt5}(3+sqrt5)(sqrt5-1)`
`=sqrt{6-2sqrt5}(sqrt5-1)(3+sqrt5)`
`=sqrt{(sqrt5-1)^2}(sqrt5-1)(3+sqrt5)`
`=(sqrt5-1)^2(3+sqrt5)`
`=(6-2sqrt5)((6+2sqrt5)/2)`
`=(36-20)/2`
`=16/2=8`
