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6. ν¨μ \( f(x) = 2x^3 - 9x^2 + ax + 5 \) λ \( x=1 \) μμ κ·Ήλμ΄κ³ , \( x=b \) μμ κ·Ήμμ΄λ€. \( a + b \)μ κ°μ? (λ¨, \(a\), \(b\)λ μμμ΄λ€.) [3μ ] \begin{itemize} \item[1] 12 \item[2] 14 \item[3] 16 \item[4] 18 \item[5] 20 \end{itemize} |