已知复数
,当
时,
恒成立,则实数
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da2e39ee112b8751c7e6e4c87c69113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b06387179d53c1e474fcfcb408b1e.png)
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更新时间:2017-05-03 07:41:00
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【推荐1】已知
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【推荐2】(1)设函数f(x)=x2﹣1,对任意
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解题方法
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