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f(x)=x^2+2ax+1=(x+a)^2+1-a^2 頂點座標(-a,1-a^2) 當x≤-a時,函數遞減,當x≥-a時,函數遞增. (1) 當a≥0,即-a≤0時,函數遞增.最大值為f(1) (2) 當01時,函數遞減,f(1)不能為最大值,不滿足題意. 綜上,a的取值範圍為:a>-1/2
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