解题方法
1 . 已知函数f(x),当x,y∈R时,恒有f(x+y)=f(x)+f(y).当x>0时,f(x)>0
(1)求证:f(x)是奇函数;
(2)若
,试求f(x)在区间[﹣2,6]上的最值;
(3)是否存在m,使
对于任意x∈[1,2]恒成立?若存在,求出实数m的取值范围;若不存在,说明理由.
(1)求证:f(x)是奇函数;
(2)若
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572593257357312/1572593263230976/STEM/a4b63c7ee1b444b5a7e94b17eb0ffa48.png)
(3)是否存在m,使
![](https://img.xkw.com/dksih/QBM/2016/4/14/1572593257357312/1572593263230976/STEM/b68160434874448b9eea00288af70323.png)
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2016-12-04更新
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738次组卷
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2卷引用:2015-2016学年河南新乡一中高二重点下七次周练文数学卷
2 . 已知函数
,![](https://img.xkw.com/dksih/QBM/2016/10/20/1573084344827904/1573084350914560/STEM/d89ca161a445413c9db4a9715a63641f.png)
(1)用定义法证明
在
上是增函数;
(2)求出所有满足不等式
的实数
构成的集合;
(3)对任意的实数
,都存在一个实数
,使得
,求实数
的取值围.
![](https://img.xkw.com/dksih/QBM/2016/10/20/1573084344827904/1573084350914560/STEM/999cfaa83f9c45bbb4b356b1fe2ef26b.png)
![](https://img.xkw.com/dksih/QBM/2016/10/20/1573084344827904/1573084350914560/STEM/d89ca161a445413c9db4a9715a63641f.png)
(1)用定义法证明
![](https://img.xkw.com/dksih/QBM/2016/10/20/1573084344827904/1573084350914560/STEM/b518776a5c614ce8acfb0142e11e7173.png)
![](https://img.xkw.com/dksih/QBM/2016/10/20/1573084344827904/1573084350914560/STEM/89c6efd13b344ef3989687e35a9f869a.png)
(2)求出所有满足不等式
![](https://img.xkw.com/dksih/QBM/2016/10/20/1573084344827904/1573084350914560/STEM/188b0aa7cb3143ef93704ce58c4df648.png)
![](https://img.xkw.com/dksih/QBM/2016/10/20/1573084344827904/1573084350914560/STEM/6063c96f8bec46b69bf17ef45baf3d68.png)
(3)对任意的实数
![](https://img.xkw.com/dksih/QBM/2016/10/20/1573084344827904/1573084350914560/STEM/47d5418ca895474cbe6e5055f55aec89.png)
![](https://img.xkw.com/dksih/QBM/2016/10/20/1573084344827904/1573084350914560/STEM/fd0b7b5e6a104c39a085c0580279f355.png)
![](https://img.xkw.com/dksih/QBM/2016/10/20/1573084344827904/1573084350914560/STEM/228bccdfb29641588ee30b55f9ca7f12.png)
![](https://img.xkw.com/dksih/QBM/2016/10/20/1573084344827904/1573084350914560/STEM/485bcc07cf2649e4bec1ef3499c3de2f.png)
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