(04年湖南卷文)若f(x)=-x2+2ax与在区间[1,2]上都是减函数,则a的值范

04年湖南卷文)f(x)=-x2+2ax在区间[1,2]上都是减函数,则a的值范围是(   

       A   B    C.(01              D

答案

答案:D

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