题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104400-51746.png)
A.﹣4或﹣2 | B.﹣4或2 | C.﹣2或4 | D.﹣2或2 |
答案
解析
若f(a)=4,则﹣a=4,解得a=﹣4
当a>0时
若f(a)=4,则a2=4,解得a=2或a=﹣2(舍去)
故实数a=﹣4或a=2
故选B
核心考点
举一反三
A.﹣9 | B.﹣3 | C.9 | D.15 |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104316-92278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104316-98693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104316-92278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104317-46014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104317-68150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104317-22439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104317-25602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104317-51154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104317-25602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104318-29938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104317-51154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104318-47326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104316-92278.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104318-29938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104318-73291.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104318-97354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104318-17605.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104319-77460.png)
A.① | B.②③ | C.①② | D.①②③ |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104255-50616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104255-77780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104256-85951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104256-99863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104256-93871.png)
![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() |
则
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104258-73443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104258-56354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104239-69056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104239-35738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104239-69056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104240-62407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104240-45035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104240-79561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104241-77958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104241-44869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104241-77958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104241-74848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104241-44869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104241-76431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104239-69056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104241-19696.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104202-93382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204104202-50697.png)
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