问题178: log x/√ay^2

$$ \begin{aligned} & \log _a \frac{\sqrt{x}}{a y^2} \\ = & \log _a \sqrt{x}-\log _a a-\log _a y^2 \\ = & \frac{1}{2} \log _a x-1-2 \log _a y \end{aligned} $$

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