已知函数
.
(1)证明:
.
(2)
,使得
成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a875454c3a318e30be376740ce7b9563.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e253b0c99440bcfe689bef0fedfbfdeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c289e425a1bc45f3d991262dca6da7c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2020-03-24 10:40:11
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解题方法
【推荐1】已知函数
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(1)当
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497a9902950cbe211355b016a354288f.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03db4ea1dcb63b22cf4e917df5db581e.png)
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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(3)在(2)的条件下,是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7cf9c6c3fa07f63718af5b2eb8faeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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【推荐3】已知函数
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(1)若函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd12784846101e60c40597bb64c0ccb.png)
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(2)对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e21dc6fe0ae3b5c607b274227b547e.png)
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