4次根号27×根号3=4次根号27×4次根号9=4次根号243=3倍4次根号3
根号3=4次根号9所以 4次根号27×根号3=4次根号[27*9]=3×[4次根号3]
3*四次根号3
4次根号27×根号3=4次根号27×4次根号9=4次根号(3^3×3^2)=3×4次根号3
解：4次根号27×根号3 =(3^3)^(1/4)×3^(1/2) =3^(3/4)×3^(1/2) =3^(5/4)
