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【题目】函数y=-3x26x-2的单调递减区间是

A.-∞,1] B.[1,+∞

C.-∞,2] D.[2,+∞

【答案】B

【解析】∵y=-3x26x-2=-3x-12+1,

∴函数的单调递减区间是[1,+∞

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