已知函数
.
(1)若
,求函数
的单调区间及极值;
(2)当
时,函数
(其中
)恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da6b12d1bd44abfd831050e44a002a81.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0abdc043dbfe11722aaf3b13bb60ed18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2020-02-18 07:01:04
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(1)若曲线
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(2)记
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(3)当
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【推荐2】已知函数
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(1)讨论函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2811f486076edd7e1940ab4b273fc4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33770cd4511e0f50f2d959ffd913e97f.png)
(1)讨论函数
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9549219b9b575e5751feefecd632d2.png)
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【推荐3】已知
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(1)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcafc95a0527841c29a58d4f7d85e232.png)
(2)讨论直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d622e7e56b7d5f621895e4d2f5eccee.png)
(3)记函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca968e2c3e04e2db3cd7a2f4183b0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d41acc47493556617fe7b9e55093d10.png)
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解题方法
【推荐1】已知函数
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ed0053a82b5c2fff408390862762c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a626617358a4339f43117a7722573b07.png)
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解题方法
【推荐2】已知函数
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(1)讨论函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c922ca65c4e26222d61f53b98099b07f.png)
(1)讨论函数
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(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044cbade444489a9e29929999f55d624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79fe3414b32bbd1190b41ed8307f905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
【推荐3】已知函数
.
(1)当
时,讨论函数
的极值;
(2)若存在
,使得
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef53f8cdfc5e99b4cb8638a83c1bfd86.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b15815a75fb1503218ca45d2e9ce303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d448e1bab2873fa8e62adb7148a3c197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c84ec962ed40a10eee846651408f3bc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】已知函数
.
证明:(1)
在区间
上存在唯一的零点.
(2)对任意
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9270ae8b7f0645abd282b05a031c9e9.png)
证明:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9d1ad3f6590ef7e83a6a9f665c19d8a.png)
(2)对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/599b100243599b6dc57c333a829c129f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9812eeb386ec65c4e56c17c53867b7f.png)
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解题方法
【推荐2】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738a204595a59e913743a1b87145eb9f.png)
(1)令
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(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738a204595a59e913743a1b87145eb9f.png)
(1)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb04c9d5ffbed7062f075e0e66f688ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c344ce0550f9dcd43eae8a00091739ba.png)
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