Đáp án + Giải thích các bước giải:
`a)` `2sqrt75-sqrt108+5sqrt48`
`=2sqrt(3*5^2)-sqrt(2^2*3^2*3)+5sqrt(2^2*2^2*3)`
`=2*sqrt3*sqrt(5^2)-sqrt(2^2)*sqrt(3^2)*sqrt3+5*sqrt(2^2)*sqrt(2^2)*sqrt3`
`=2sqrt3*5-2sqrt3*3+5*2*2*sqrt3`
`=2sqrt3*5-2sqrt3*3+2sqrt3*10`
`=2sqrt3(5-3+10)=2sqrt3*12=24sqrt3`
`b)` `sqrt50-0,5sqrt800+5/3sqrt18`
`=5sqrt2-1/2*20sqrt2+5/3*3sqrt2`
`=5sqrt2-10sqrt2+5sqrt2`
`=(5-10+5)sqrt2=0`.