题目
题型:解答题难度:简单来源:不详
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184312-71827.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184312-29016.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184312-97040.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184313-31766.gif)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184312-71827.gif)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184313-32808.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184313-50045.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184313-70006.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184313-68245.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184314-33269.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184314-94351.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184314-15513.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184314-57276.gif)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184314-20091.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184314-85153.gif)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184314-57276.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184315-26969.gif)
(3)记
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184315-87324.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184315-68159.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184315-29983.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184315-13869.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184316-43384.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184316-82013.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184316-18651.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184313-68245.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184316-69039.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184315-26969.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184316-17745.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184317-13005.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184317-22868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184317-59103.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184317-40181.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184317-12244.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184315-29983.gif)
①当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184318-31667.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184318-16460.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184318-74072.gif)
②当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184318-50683.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184319-13501.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184317-22868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184319-95838.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184319-73491.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184319-53546.gif)
③当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184319-65844.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184319-13501.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184317-22868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184320-41737.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184319-73491.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184320-76815.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184314-33269.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184320-60195.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184320-47251.gif)
解析
核心考点
试题【(本小题满分14分)已知函数对一切实数x,y都有成立,且.(1)求的值 (2)求的解析式 (3)若,对任意的,总存在,使得成立,求实数的取值范围】;主要考察你对指数函数图象及性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184309-93734.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184307-84247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184307-22239.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184304-22289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184304-42034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184304-69647.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184305-82713.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184300-84130.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184300-56806.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184257-53013.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184258-12500.gif)
则实数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819184258-98583.gif)
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