已知
.
(1)若
在
处的切线与直线
平行,求证:
是增函数;
(2)若
,若
在
上有实数根,求实数k的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3030f8a23a3caeb4c82ccab1741e2ac.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62aab8a4613c70a7cd3e8cdbe243d14d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7ddc738c02f0f8e855029868507816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f168b6811f1da5f09db1d9984ad8664f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/972cfd3677c0f6342a57d3ab58cf0356.png)
更新时间:2021-12-15 19:41:27
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解答题-问答题
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适中
(0.65)
【推荐1】已知函数
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(Ⅰ)若曲线
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(Ⅱ)若
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(Ⅰ)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(Ⅱ)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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(0.65)
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【推荐2】已知函数
的图象与直线
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(1)求
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(2)求函数
的单调区间和极小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6548845294a9791d0d6e185dfd92bdda.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c0b4bf88663b0463f282a9550c1afb.png)
(1)求
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(2)求函数
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适中
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【推荐1】已知函数
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(1)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e0edcccec7839ece1980700b8df149.png)
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(2)对任意给定的正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fdc02f00cf00a6dfd88b53a90f1f7a4.png)
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适中
(0.65)
【推荐2】已知函数
,其中
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(1)讨论函数
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(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7393fc425948d4261bb6c7d67f88e1.png)
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解题方法
【推荐3】根据社会人口学研究发现,一个家庭有
个孩子的概率模型为:
其中
.每个孩子的性别是男孩还是女孩的概率均为
且相互独立,事件
表示一个家庭有
个孩子
,事件
表示一个家庭的男孩比女孩多(例如:一个家庭恰有一个男孩,则该家庭男孩多).
(1)若
,求
和
;
(2)为了调控未来人口结构,其中参数
受到各种因素的影响(例如生育保险的增加,教育、医疗福利的增加等).
①若希望
增大,如何调控
的值?
②是否存在
的值使得
,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![]() | 1 | 2 | 3 | 0 |
概率 | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78519a050b5f0803b6b3f0c7e4ffb014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f970f380a12c843bb4a74ff34a15b2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108ab49f370919e730e3567070deee65.png)
(2)为了调控未来人口结构,其中参数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
①若希望
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef5ccb0e7b118785332d753891a2679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
②是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667df0f959f5626681d6d9aecaf05be1.png)
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