已知函数
.
(1)若
恒成立,求实数
的取值范围;
(2)证明:若
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/573f185fde651a788e5f347158537e44.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)证明:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d41acc47493556617fe7b9e55093d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d75951883fee5f86356bf80c988bbf.png)
更新时间:2016-12-04 19:29:34
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(2)若
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【推荐1】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
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