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12. μ€μ μ 체μ μ§ν©μμ μ°μμΈ ν¨μ $f(x)$κ° λͺ¨λ μ€μ $x$μ λνμ¬ \[ \{f(x)\}^3 - \{f(x)\}^2 - x^2 f(x) + x^2 = 0 \] μ λ§μ‘±μν¨λ€. ν¨μ $f(x)$μ μ΅λκ°μ΄ 1μ΄κ³ μ΅μκ°μ΄ 0μΌ λ, \[ f\left( -\frac{4}{3} \right) + f(0) + f\left( \frac{1}{2} \right) \] μ κ°μ? [4μ ] \begin{itemize} \item[1] $\frac{1}{2}$ \item[2] $1$ \item[3] $\frac{3}{2}$ \item[4] $2$ \item[5] $\frac{5}{2}$ \end{itemize} |