题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114739-91072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114740-13104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114740-85301.png)
(1)求A
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114740-84795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114740-54071.png)
(3) 若关于
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-67171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-71035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-73027.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-38633.png)
(2)增区间为(-∞,
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-77278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-75895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-77278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-75895.png)
(3)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-23650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-27603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-11942.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114743-29350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-38633.png)
(2)先求导数,得(
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114743-20858.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114743-78015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114743-67417.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114744-61171.png)
解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-38633.png)
(2)先求导数,得(
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114743-20858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-77278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-75895.png)
因此,当x∈(-∞,
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-77278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-75895.png)
令3x2-6x+2≤0, 解得
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114744-99140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114744-59166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114744-72437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114744-44374.png)
∴函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114743-20858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-77278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-75895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114741-77278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-75895.png)
(3) 解: 由
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114743-78015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114743-67417.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114745-10469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114745-99634.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114745-94691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114745-49465.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114746-35579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114746-18250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114746-24642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114746-67308.png)
∴函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114746-99322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114747-27746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114747-52609.png)
∴当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114745-49465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114746-99322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114747-84118.png)
而函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114747-71818.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114745-49465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114747-19780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114748-55154.png)
∴ 当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-23650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-27603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114742-11942.png)
核心考点
试题【 (本小题满分14分)规定其中x∈R,m为正整数,且=1,这是排列数A(n,m是正整数,且m≤n)的一种推广.(1)求A的值; (2)确定函数的单调区间. (3】;主要考察你对函数的单调性与导数等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114731-24274.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114731-84379.jpg)
(I)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114731-12900.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114732-35973.jpg)
(II)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114732-98590.jpg)
(III)证明对任意的正整数n,不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114732-82646.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114726-80950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114726-57382.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114718-97101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114718-24385.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114718-96721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114718-67759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114719-90727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114719-77807.png)
(2)讨论函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114718-96721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114719-80171.png)
(3)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114718-96721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114719-20452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114719-75711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114702-35880.png)
(1)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114702-53346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114703-33889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114703-36623.png)
(2)讨论函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114702-53346.png)
(3)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114703-43680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114703-89428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114704-70271.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018114704-52397.png)
A.(-∞,2) | B.(0,3) | C.(1,4) | D.(2,+∞) |
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