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由題意知,f(x) 的導數為 3x² - 1 令其等於 0 解得 x² = 1/3 由 f(x) 的圖形知 f(x)′=3x² - 1 < 0 得 -1/√3 < x < 1/√3 f(x)=x3-x在(0,a]上遞減,在[a,+∞)上遞增 則 a = -1/√3
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