函数
的定义域为D,若存在闭区间
,使得函数
同时满足:(1)
在
内是单调函数;(2)
在
上的值域为
,则称区间
为
的“
倍值区间”.
下列函数中存在“3倍值区间”的有_____.
①
;②
;③
;④
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86e22051b36801cfb069457ff55493c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
下列函数中存在“3倍值区间”的有_____.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9de5a6a753dd9af91c0937f8b388add3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d07cf946c9cb4a52d8edfd22f05a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6d671c9a519ba2f1c970a65f0a21be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6263576e5c3f2324a8dac311476bf9.png)
更新时间:2018-01-27 19:18:06
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【推荐2】函数
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①
是
在
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②
是
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④
是
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