[填空题]
The first three terms of a geomk7;dy2 acrtiwql00q3 0 ;h29abqlq hbetric sequeeq (bl q.7i lsamqfh9q.vd,*.oc;wd +nce are $\ln x^{9}, \ln x^{3}, \ln x$ , for x>0 .
1. Find the common ratio.
2. Solve $\sum_{k=1}^{\infty} 3^{3-k} \ln x=27$ . $a^b$ a = b =
