已知函数
.
(1)若
恒成立,求a的取值范围;
(2)证明,对
.都有
:
(3)设
是
的两个零点,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfcea74d330997ee9c92a223c0335851.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6acb0f1ac694dd177e99fc385f23318.png)
(2)证明,对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac657ea5bbf4b237a30e4074c76cc81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403d65e1f3ba1d9f5a044d491c2e702e.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff60eab72de85437e12806474281612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3ad8c843c361565d0f3cb06da49f60.png)
更新时间:2021-10-16 15:15:29
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名校
解题方法
【推荐1】已知函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/677c322c843707d031ef7bc8378c5261.png)
(1)当
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(2)对于区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9210e75c35fb455d0446eb7ddba7d79c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191a9f1cd3402de148664b7fbe7a0c79.png)
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困难
(0.15)
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【推荐2】已知函数
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(1)若
在定义域内恒成立,求
的取值范围;
(2)当
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(3)证明不等式
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da0063628f6f4c8f4e6d81fdcda0171.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e38c541dec8fce1d26886e5ef7d21f.png)
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(2)当
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(3)证明不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bd495c4f3e0f3f1258909480c28e22.png)
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(1)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
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【推荐1】已知函数
.
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(2)证明:函数
有且仅有两个异号的零点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4283c448f4dc8316e98e7c75cc1dca9.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
(2)证明:函数
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(Ⅰ)求实数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(Ⅱ)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5432d4cbf835851d73febc9807882cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1cc4329e9ce6769a28037a0884f2c4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ca13a93b5f401c0d39ba52b0cffcb0.png)
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