[填空题]
1. Show that $3 \log _{a^{3}} x=\log _{a} x$ where a, $x \in \mathbb{R}^{+}$ .
2. It is given that $\log _{2} y+\log _{8} 4 x^{2}+\log _{8} 2 x=0$ .
Express y in terms of x . Give your answer in the form $y=b x^{c}$ where b, c are constants. $y$ =
3. The region R , is bounded by the graph of the function found in part (b), the x -axis, and the lines x=1 and x=k where k>1 . The area of R is $ \frac{3}{2}$ . Find the value of $k$ =
