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25. νμ \(\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1\) μμ μ \((2, 1)\)μμμ μ μ μ κΈ°μΈκΈ°κ° \(-\frac{1}{2}\)μΌ λ, μ΄ νμμ λ μ΄μ μ¬μ΄μ 거리λ? (λ¨, \(a, b\)λ μμμ΄λ€.) [3μ ] \begin{itemize} \item[1] \(2\sqrt{3}\) \item[2] \(4\) \item[3] \(2\sqrt{5}\) \item[4] \(2\sqrt{6}\) \item[5] \(2\sqrt{7}\) \end{itemize} |