log2(3次根号下1/16乘以6次根号下16)
=log2(3次根号下1/16)+log2(6次根号下16)
=(1/3)log2(2的-4次方)+(1/6)log2(2的4次方)
=(-4/3)log2(2)+(4/6)log2(2)
=-4/3+4/6
=-8/6+4/6
=-4/6
=-2/3