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12. ν•¨μˆ˜ \( f(x) = \frac{1}{9} x (x - 6)(x - 9) \)와 μ‹€μˆ˜ \( t \ (0 < t < 6) \)에 λŒ€ν•˜μ—¬ ν•¨μˆ˜ \( g(x) \)λŠ”

\[
g(x) = 
\begin{cases} 
f(x) & (x < t) \\
-(x - t) + f(t) & (x \geq t)
\end{cases}
\]

이닀. ν•¨μˆ˜ \( y = g(x) \)의 κ·Έλž˜ν”„μ™€ \( x \)μΆ•μœΌλ‘œ λ‘˜λŸ¬μ‹ΈμΈ μ˜μ—­μ˜ λ„“μ΄μ˜ μ΅œλŒ“κ°’μ€? [4점]

\begin{itemize}
    \item[1] \(\frac{125}{4}\)
    \item[2] \(\frac{127}{4}\)
    \item[3] \(\frac{129}{4}\)
    \item[4] \(\frac{131}{4}\)
    \item[5] \(\frac{133}{4}\)
\end{itemize}