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7. ν¨μ $f(x) = \frac{1}{3}x^3 - 2x^2 - 12x + 4$κ° $x = \alpha$μμ κ·Ήλμ΄κ³ $x = \beta$μμ κ·ΉμμΌ λ, $\beta - \alpha$μ κ°μ? (λ¨, $\alpha$μ $\beta$λ μμμ΄λ€.) [3μ ] \begin{itemize} \item[1] $-4$ \item[2] $-1$ \item[3] $2$ \item[4] $5$ \item[5] $8$ \end{itemize} |