题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050900-20077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050901-84968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050901-37228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050901-62553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050901-44618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050901-31562.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
答案
解析
即[f(x)g(x)]">0故F(x)在x<0时递增,
又∵F(x)=f(x)g(x)是R上的奇函数,∴F(x)的图象关于原点对称,
所以F(x)在x>0时也是增函数.∵f(2)g(2)=0,∴f(-2)g(-2)=0.
即F(-2)=0且F(2)=0所以F(x)>0的解集为:x<-2或0<x<2.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050847-94866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050847-11986.png)
(Ⅰ)试把方盒的体积
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050847-56176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050847-11986.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050847-11986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050847-56176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050834-74737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050835-15770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050835-72796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050835-52097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050836-54723.png)
(Ⅰ) 求
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050836-43227.png)
(Ⅱ)求曲线
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050835-72796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050836-54723.png)
(Ⅲ)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050836-78688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050836-36201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050836-57533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050811-12538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050811-78561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050811-14280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050812-49769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050812-22540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050812-75043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050811-14280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050812-64835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050813-71402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050813-85402.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050800-70446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050801-46695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050801-75596.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050801-32304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050801-40895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050802-69689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205050802-81952.png)
A.36 | B.24 | C.18 | D.12 |
A.![]() | B.![]() |
C.![]() | D.![]() |
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