我们常常称恒成立不等式
(
,当且仅当
时等号成立)为“灵魂不等式”,它在处理函数与导数问题中常常发挥重要作用.
(1)试证明这个不等式;
(2)设函数
,且在定义域内恒有
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec75cc976c63df8ac86c4f89662a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d9c89d2cd1fb46b1e71ad10227c098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679353e656a54993c041ebd39ec7b31b.png)
(1)试证明这个不等式;
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bae722b43102313b63d4f5021bb0ad82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21999ae6c071578a6b9e631ebdeb999b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2018-12-10 21:51:26
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【推荐1】已知函数
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(1)讨论
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(2)若
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解题方法
【推荐2】已知函数
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(1)当
时,求
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(2)若
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的取值范围,并证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e9f45f86ee4cac88d16435393c7cec.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b448fe164c2c2931805e3b3847dcdd75.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.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/0a6936d370d6a238a608ca56f87198de.png)
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您最近一年使用:0次
解答题-问答题
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(0.4)
解题方法
【推荐1】设函数
.
(1)若函数
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(2)当
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的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7e7a30d274db960de765b8b4a037e9.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c765461ae1a6c70f5cbdcb6c932a22b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1417a39c99b1e6b489c7c033a0625af.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a70e419b6d2bcefb94b612016d92d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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(1)讨论函数
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(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e21b6943d417c477539ca24b0fb016.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
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您最近一年使用:0次
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|
较难
(0.4)
名校
【推荐3】已知函数
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(1)讨论
的单调性;
(2)若
存在极值,且
在
上恒成立,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264e22445cc47a7eb6319add2b33cb43.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a7a4a037a4dfe973f1eb683d93d799.png)
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