根号3×根号8
=根号(3×8)
=根号(2²×6)
=2×根号6
≈2×2.449
≈4.90
根号12×根号50
=根号(12×50)
=根号(10²×6)
=10×根号6
≈10×2.449
≈24.49
根号3分之根号2
=根号3²分之根号2×根号3
=3分之根号(2×3)
=3分之根号6
≈2.449÷3
≈0.82
根号2分之根号27
=根号2²分之根号27根号2
=2分之根号(27×2)
=2分之根号(3²×6)
=2分之3倍根号6
≈(3/2)×2.449
≈3.67