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13. λ μμ \( a, b \ (1 < a < b) \)μ λνμ¬ μ’ννλ©΄ μμ λ μ \((a, \log_2 a), \ (b, \log_2 b)\)λ₯Ό μ§λλ μ§μ μ \(y\)μ νΈκ³Ό λ μ \((a, \log_4 a), \ (b, \log_4 b)\)λ₯Ό μ§λλ μ§μ μ \(y\)μ νΈμ΄ κ°λ€. ν¨μ \( f(x) = a^{bx} + b^{ax} \)μ λνμ¬ \( f(1) = 40 \)μΌ λ, \( f(2) \)μ κ°μ? [4μ ] \begin{itemize} \item[1] 760 \item[2] 800 \item[3] 840 \item[4] 880 \item[5] 920 \end{itemize} |