Đáp án+Giải thích các bước giải:
`a)sqrt2(sqrt8-sqrt32+3sqrt18)`
`=sqrt2(2sqrt2-4sqrt2+9sqrt2)`
`=sqrt2.7sqrt2=14`
`b)(2sqrt18-3sqrt7+5sqrt63)sqrt112`
`=(6sqrt2-3sqrt7+15sqrt7).sqrt112`
`=(6sqrt2+12sqrt7).4sqrt7`
`=24sqrt14+336`
`c)(4sqrt27-2sqrt48-5sqrt75):2sqrt3`
`=(12sqrt3-8sqrt3-15sqrt3):2sqrt3`
`=-11sqrt3:2sqrt3`
`=-11/2`
`d)(2sqrt3+sqrt5).sqrt3-sqrt60`
`=6+sqrt15-2sqrt15`
`=6-sqrt15`
`e)(sqrt28-sqrt12-sqrt7).sqrt7+2sqrt21` `
`=(2sqrt7-2sqrt3-sqrt7).sqrt7+2sqrt21`
`=7-2sqrt21+2sqrt21`
`=7`
`f)(sqrt99-sqrt18-sqrt11).sqrt11+3sqrt22`
`=(3sqrt11-3sqrt2-sqrt11).sqrt11+3sqrt22`
`=2sqrt11.sqrt11-3sqrt22+3sqrt22`
`=22`
