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8. λ μ€μ \( a = 2 \log \frac{1}{\sqrt{10}} + \log_2 20, \ b = \log 2 \) μ λνμ¬ \[ a \times b \]μ κ°μ? [3μ ] \begin{itemize} \item[1] 1 \item[2] 2 \item[3] 3 \item[4] 4 \item[5] 5 \end{itemize}