已知函数
,其导函数为
.
(1)当
,求
图象在
处的切线方程;
(2)设
在定义域上是单调函数,求
得取值范围;
(3)若
的极大值和极小值分别为
、
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c15422105c6b7b8d5ddf36e26902c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/032dcc0850a31e2a3f9f6968ad49cdde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d6ef5e44ed72f082f2919aebcab0e0.png)
更新时间:2020-03-18 17:39:24
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【推荐1】已知函数f(x)=2xlnx﹣x
2.
(1)求曲线y=f(x)在点(1,f(1))处的切线方程
(2)若方程f′(x)=a在[
,+∞)有且仅有两个实根(其中f′(x)为f(x)的导函数,e为自然对数的底),求实数a的取值范围.
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(1)求曲线y=f(x)在点(1,f(1))处的切线方程
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0df6bd7242925001cc8ca876c97f4dd.png)
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【推荐2】已知函数
.
(1)求曲线
在点
处的切线方程;
(2)当
时,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a903745cd2cb536443d07579b606ece5.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c6b6a11760d0724b0b60e55970e229.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0112226ef7215a7b8cdb7e1922cb8947.png)
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【推荐1】已知函数
,
.
(1)若
,求函数
的单调递增区间;
(2)若函数
在区间
上单调递增,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22538e0ad07cad746b9250c5b20a13c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ef022cb5ccd3757adda282dccca52b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fab11f38ab8593932082ec4d9c8c91f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
【推荐2】已知函数
.
(1)若函数在
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(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5229474eae1354f300c1071d61dac1.png)
(1)若函数在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0c709bb0d173fc3ea08b98cdd471768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930f9118a952ef0c09c1803ac3668515.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53224898de85a85058ad336490bbbaa7.png)
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解题方法
【推荐3】设函数
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(1)若
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(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a53959394e317887a145ae70d2f2ad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107b9d3da7a4d5c67d41e910b4d5a9fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292b791c7cf21c172e6e7f97f04be176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
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【推荐1】已知函数
.
(1)求证:函数
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(2)设
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.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015c6fa35b605855fb6fff14566e2fb7.png)
(1)求证:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
(2)设
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【推荐2】设函数
.
(1)若函数
在
处的切线与
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(1)若函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
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(2)证明:当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
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【推荐3】某学校常年开设某课程,今年该校在某年级开设的该课程共有若干个班,由若干位不同的老师授课,其中某位老师班上的评分标准如下:每位同学该课程的分数(满分
分)由两部分组成,一部分为“平时分”,学期内共有
次考勤,每次出勤计
分,另一部分为“期末分”,是由期末考试的卷面成绩(满分
分)按照卷面成绩比期末分
的比例折算而来.如,一名同学出勤
次,期末考试的卷面成绩为
分,则该同学该课程的最终评分为:
(分).
(1)一同学期末考试的卷面成绩为
分,假设该同学每次考勤时出勤的概率均为
且互相独立,求该同学的最终评分及格(即大于等于
分)的概率
(结果保留三位小数);
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,标准差约为
,且学生成绩
近似满足正态分布
.据此,该老师估计该年级几乎没有需要重修(即分数未达到
分)的学生,请用所学知识解释老师的这一观点;
(3)泊松分布可以用来描述某些小概率事件的发生.若随机变量
服从参数为
的泊松分布(记作
),则
,其中
为自然对数的底数.根据往年的数据,我们认为该课程每年每个班级需要重修的学生数量
近似服从泊松分布,假设
,证明每年每个班级出现多于一名需要重修该课程的学生的概率低于百分之一.
参考数据:
,
,
,
若
,则
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38064aedee831ea4fdfca26976b93676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180ea775f2af05650404d764384e7faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17161b28b6ad8f57abc5b11e1b6c671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f455431a80dcca93996dcabdea684be9.png)
(1)一同学期末考试的卷面成绩为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8f70f0c1b960fa850d67c4091e04400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52dbd64028ab37a28942a961993ad21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)经过统计,教务处公布今年该课程的该年级平均分约为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d0810522a5ee9fbc0097f9520a1e50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b4ad4f30355002ab3715f11f2c3d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45683f6ce2a361c2e2ca398c97b0b0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
(3)泊松分布可以用来描述某些小概率事件的发生.若随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b045ce84b90175882dc7d566deb1ee2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07af517aa3eba50e7c8e2d5bb8b5cc05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8d43f3c2c6a3c478d35c74314c3b49.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb86581ec1bb61dd8c41da4365a620c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4da174915809038b73a2934c5822ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3473bfae3d5e1b1c6c7a2575a2efa8.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1290917c2c835b61384480b335cc1d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94939ad21cfa269ff6ca60cb4abdbd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58aec81374123b483c24c877e1be2413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ca90ea0b9c050c6525ca9a15eb149f.png)
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