1：√2/3+3√1/6-1/2√54

1：√2/3+3√1/6-1/2√54
1：√2/3+3√1/6-1/2√54

1：√2/3+3√1/6-1/2√54
原式=(√6)/3+3(√6)/6-1/2×3√6
=(1/3+1/2-3/2)×√6
=-2(√6)/3

√2/3＋3√1/6－1/2√54
＝√6/3＋√6/2－3√6/2
＝﹣2√6/3.