已知函数
,
,其中
.
(1)证明:当
时,
;当
时,
;
(2)用
表示
中的最大值,记
.是否存在实数a,对任意的
,
恒成立.若存在,求出
,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ec08ec41b4c6610befef88efdd1cd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446318e79ee96fef166db246c3b2c799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e38c541dec8fce1d26886e5ef7d21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b666663ce3537a634a3b427b418eb62.png)
(2)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1bfb9487f824ff9fd2a1a281f8d62f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f66fd3129db024daf48dfd8c4673a9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94198db0631951a6455f03128b557a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
20-21高三·云南·阶段练习 查看更多[5]
云南省师范大学附属中学2022届高三高考适应性月考卷(四)数学(文)试题(已下线)第20讲 不等式恒成立之max,min问题-突破2022年新高考数学导数压轴解答题精选精练(已下线)专题07 不等式恒成立问题-1(已下线)重难点突破07 不等式恒成立问题(十大题型)-2(已下线)重难点突破05 利用导数研究恒(能)成立问题(十一大题型)-1
更新时间:2023-05-01 00:07:12
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解答题-证明题
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【推荐2】已知函数
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(1)求函数
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![](https://img.xkw.com/dksih/QBM/2015/3/26/1572038353813504/1572038359490560/STEM/58f1ff3c2db54bec9ae677b0cee168c1.png)
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![](https://img.xkw.com/dksih/QBM/2015/3/26/1572038353813504/1572038359490560/STEM/6a6da1a88f0e4270997302baffa99d89.png)
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【推荐1】已知函数f(x)=lnx
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解题方法
【推荐2】设
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9052001bb15ff67ba2fb147b6198462c.png)
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(2)证明:
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【推荐3】已知函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ffd1d81438563bea6a0e1b9d9d37ac.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e81b4aac721bcd4a49593b48a28a8f1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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