已知函数
(其中
,
),
.
(1)若存在实数
使得
恒成立,求
的取值范围;
(2)当
时,讨论函数
的零点个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ba1d3c7a0cf6f6f0279b73c831eb129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856dab8319459d258887c8b3522a2430.png)
(1)若存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95f508b729dc827853ed61c5a07b150e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c0a8155f5a6af42d37856f6c95a0bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df49341b57eb107f416a014903ce25a8.png)
20-21高三下·全国·阶段练习 查看更多[2]
更新时间:2021-03-22 14:22:52
|
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解答题-证明题
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困难
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解题方法
【推荐1】已知函数
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(3)求证
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9c594a89167c4dee4bc13e921a4799.png)
(1)若
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0511338aa078cca149b4eb2645e3a7.png)
(3)求证
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【推荐2】已知函数
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(1)若函数
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(2)已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8cae6d37a195a005adec79e3f312fa8.png)
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【推荐3】已知函数
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(1)若函数
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(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf7bf3192755667df35fcbdf5324286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7d87fdc38060d34f1417c3ad184215.png)
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【推荐1】已知函数
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(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c6b6a11760d0724b0b60e55970e229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)若对于任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168163183a3d4663be45755f44676191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94dae7c191953aa0f559a9e384dede6.png)
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(2)若
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【推荐3】已知函数f(x)=ax+lnx+1(a∈R),
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【推荐1】已知
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(ⅰ)
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(Ⅰ)证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c12304c6cf3e8ef56445e632e9549774.png)
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(ⅰ)
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【推荐2】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9849b8f5976d59dca2e6926c3c048d00.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9849b8f5976d59dca2e6926c3c048d00.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5828873f8369183faf71181cda5b61d2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
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