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f(x)=4x²;-mx+5 影像開口向上,對稱軸x=m/8 ∴在[m/8,+∞)上是增函數 要在[-2,+∞)上增函數 則m/8≤-2 即m≤-16 ∴f(-1)=9+m≤-7 即f(-1)的範圍是(-∞,-7]
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