(√6-2√15)×√3-6√1/2
= (√6×√3-2√15×√3) ×√3-6(√2)/2
=3√2-6√5-3√2)
=-6√5
√2/3-4√216+42√1/6
=√2/3-4√216+42(√6)/6
=(√6)/3-24√6+7√6
=-（50√6）/3