Lời giải và đáp án:
`a,` `sqrt(36.81.144)=sqrt(419904)=sqrt((648)^2)=648`
`b)` `sqrt(490.160)=sqrt(78400)=sqrt((280)^2)=280`
`c)` `sqrt(0,16.0,4)=sqrt(0,064)={2sqrt10}/25`
`d)` `sqrt3.sqrt(27)=sqrt(3.27)=sqrt(81)=sqrt((9)^2)=9`
`f)` `sqrt(2,7).sqrt5.sqrt(1,5)=sqrt(2,7.5.1,5)=sqrt(20,25)=sqrt((4,5)^2)=4,5`
`g)` `sqrt(2,5).sqrt(48).sqrt(30)=sqrt(2,5.48.30)=sqrt(3600)=sqrt((60)^2)=60`
