[问答题]
1. Write down the domain an7- ;6 rjmte3v8vpzp a9+hd cti8yn4 hxd racw3 wkqv;-u-l 3azs5o1oy 0z jnge of the logarithmic function $y=\log _{a}$ x where a>0 and a $\neq 1$ .
2. Given that $\log _{x^{2}} y=9 \log _{y}\left(x^{2}\right)$ , find all the possible expressions of y as a function of x .
