题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112103-82068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112103-42038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112103-89815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112103-28670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112104-54975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112104-84407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112104-45447.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112104-48997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-47653.png)
(Ⅱ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-27413.png)
(Ⅲ)若
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-94499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-22472.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-62553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-31328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-12910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-69010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-20882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-22472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-64827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-35837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-85474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-22472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112108-78834.png)
解析
试题分析:(Ⅰ)对应抽象函数,一般方法为赋值法. 在
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112103-89815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112108-77751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-62553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112103-89815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112108-83154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-31328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112103-89815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112108-15783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112109-42519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112109-90967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112109-96307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112104-54975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112109-61702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-12910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112104-45447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-22472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112110-64453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112110-73903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112110-67752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112110-46521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-69010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-20882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-22472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-64827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-35837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-85474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-22472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112108-78834.png)
解:(Ⅰ)在
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112103-89815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112108-77751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-62553.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112103-89815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112108-83154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-31328.png)
(Ⅱ)在
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112103-89815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112108-15783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112109-42519.png)
得
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112109-90967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112109-96307.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112104-54975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112109-61702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-12910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112104-45447.png)
(Ⅲ)数列
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-22472.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112110-64453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112110-73903.png)
显然
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112110-67752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112110-46521.png)
所以当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112106-69010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-20882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-22472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-64827.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-35837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112107-85474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112105-22472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112108-78834.png)
核心考点
试题【已知函数对任意都满足,且,数列满足:,.(Ⅰ)求及的值;(Ⅱ)求数列的通项公式;(Ⅲ)若,试问数列是否存在最大项和最小项?若存在,求出最大项和最小项;若不存在,】;主要考察你对函数的相关概念等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112048-73563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112048-13205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112049-67978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112049-69350.png)
的零点的个数为( )
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204112019-36607.png)
A.(-∞,-3]∪[-1,+∞) |
B.[-3,-1] |
C.[-3,-1]∪(0,+∞) |
D.[-3,+∞) |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111921-77514.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111921-18662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111921-48669.png)
(2)若不等式
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111922-22863.png)
(3)证明:当a=0时,
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111922-44537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111912-59585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111913-10293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111913-81262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111913-81262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111913-10293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111913-26819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111913-10293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111913-13075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111913-91309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111913-10293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111914-20667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111914-26273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111914-49848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111913-91309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111913-10293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111914-39253.png)
A.4 | B.3 | C.2 | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111832-65489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111832-18986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204111832-18986.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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