The equation $16 x^{4}+16 x^{3}-4 x-1=0$ has a multiple root. If $\alpha, \beta, \gamma, \delta$ are the roots of this equation, then $\frac{1}{\alpha^{4}}+\frac{1}{\beta^{4}}+\frac{1}{\gamma^{4}}+\frac{1}{\delta^{4}}=$

The solution set of the equation $3^{x}+3^{1-x}-4 < 0$ contained in $R$ is

The common solution set of the inequations $x^{2}-4 x \leq 12$ and $x^{2}-2 x \geq 15$ taken together is

With respect to the roots of the equation $3 x^{3}+b x^{2}+b x+3=0$, match the items of List I with those fo List II

List I	List II
A All the roots are negative.	I. $(b-3)^2=36+P^2$ for $P \in R$
B Two roots are complex.	II. $-3<b<9$
C Two roots are positive.	III. $b \in(-\infty,-3) \cup(9, \infty)$
D All roots are real and	IV. $b=9$
	V. $b=-3$