Exponents & Logs (id: b24feb419)

本题目来源于试卷:  Exponents & Logs，类别为 IB数学

[填空题]
$\text { Solve the equation } 15^{4 a}=81^{a+2} \text { for } a \text {. Express your answer in terms of } \ln 3 \text { and } \ln 5 \text {. }$   

参考答案: 2ln3/ln5


本题详细解析:

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