已知函数
(
为自然对数的底数).
(1)当
时,求函数
的极值;
(2)若不等式
在区间
内有解,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c2b460911faece8a596ecc00d8aef4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae018fde08edf0539089f98c17e11ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f11e274b763a2c6a7b0f395df4a3c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9911630b451e936f19f6ce3575803c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2019-05-17 22:09:46
|
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解答题-证明题
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名校
解题方法
【推荐1】已知函数
.
(1)当
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(2)当
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;
(3)直接写出a的一个取值范围,使得
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435bd56bf051dc7cf90bcc12342c04f3.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10ede78fd7ac619ea597856254bb5d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c950d3d9ec5fe8d2095561d9d9c9be66.png)
(3)直接写出a的一个取值范围,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4031c291fe7b756984ab759268eafdf7.png)
您最近一年使用:0次
解答题-问答题
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较难
(0.4)
解题方法
【推荐2】已知函数
,
.
(1)当
时,求函数
的极值;
(2)当
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,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9ec61883b99aecff33d21f106c7f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6092d598715abf932efea5f5835b410a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐3】设函数
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(1)当
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(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6def9b607947b65927256dbb3138b862.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5f421939ee855f25927e7570d82c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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.
(1)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c285e83c331386c41ae41070a3064e3a.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/990d3feee85e869ea9ab561ff63d46a2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c06f2a5d674b53873b62a90d5b3578f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53fbe0c86d67e1d156c7e039d129103a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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