Exponents & Logs (id: 13e703439)

本题目来源于试卷:  Exponents & Logs，类别为 IB数学

[填空题]
The first three terms of a avgi,(n.qted g 03fs2geometric seque j-ru i.zd i9e6u/n8lhnce are $\ln x^{9}, \ln x^{3}, \ln x$ , for x>0 .
1. Find the common ratio.   
2. Solve $\sum_{k=1}^{\infty} 3^{3-k} \ln x=27$ . $e^a$ a =   

参考答案:
空格1: 1/3±2%  空格2: 2 


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