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当时.不等式恒成立.则实数的取值范围为
当时.不等式恒成立.则实数的取值范围为
发布时间:2021-02-20 13:05:30
当时,不等式恒成立,则实数的取值范围为
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答案:
解析:恒成立的解集为R,求的范围,即小于的最小值.
令.
当时,的最小值为1.
或.
或.
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