原式可以变为-6*a^(1/4-1/2)*b^(-1/3+2/3)除以【-1/4*a^(-1/4)*b^(-2/3)】,则继续化简为-6*a^(-1/4)*b^(1/3)除以【-1/4*a^(-1/4)*b^(-2/3)】,则等于24*a^(-1/4+1/4)*b^(1/3+2/3),则最后结果为24*a^(0)*b^(1)=24b