题目内容
已知函数
.
(Ⅰ) 若直线y=kx+1与f (x)的反函数的图像相切, 求实数k的值;
(Ⅱ) 设x>0, 讨论曲线y=f (x) 与曲线
公共点的个数.
(Ⅲ) 设a<b, 比较
与
的大小, 并说明理由.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743515725.png)
(Ⅰ) 若直线y=kx+1与f (x)的反函数的图像相切, 求实数k的值;
(Ⅱ) 设x>0, 讨论曲线y=f (x) 与曲线
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743531772.png)
(Ⅲ) 设a<b, 比较
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743562749.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743578733.png)
(Ⅰ) ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743593503.png)
(Ⅱ)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157435931205.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157436251222.png)
(Ⅲ)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743593503.png)
(Ⅱ)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157435931205.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157436251222.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157436401189.png)
(Ⅲ)
函数![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743656880.png)
(Ⅰ). 函数![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743671691.png)
,设切点坐标为
则
,
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082401574374923167.png)
(Ⅱ)令
,设![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743781865.png)
有![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157437962888.png)
,所以![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157438271197.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157436251222.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157436401189.png)
(Ⅲ)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157438591079.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082401574387410313.png)
本题考查函数、导数、不等式、参数等问题,属于难题.第二问运用数形结合思想解决问题,能够比较清晰的分类,做到不吃不漏.最后一问,考查函数的凹凸性,富有明显的几何意义,为考生探索结论提供了明确的方向,对代数手段的解决起到导航作用.
【考点定位】本题考查考查函数的凹凸性、导数、不等式、参数等问题.属于难题.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743656880.png)
(Ⅰ). 函数
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743671691.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157436871692.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743703635.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743671691.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743734970.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082401574374923167.png)
(Ⅱ)令
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157437651699.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743781865.png)
有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157437962888.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824015743812972.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157438271197.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157436251222.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157436401189.png)
(Ⅲ)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408240157438591079.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082401574387410313.png)
本题考查函数、导数、不等式、参数等问题,属于难题.第二问运用数形结合思想解决问题,能够比较清晰的分类,做到不吃不漏.最后一问,考查函数的凹凸性,富有明显的几何意义,为考生探索结论提供了明确的方向,对代数手段的解决起到导航作用.
【考点定位】本题考查考查函数的凹凸性、导数、不等式、参数等问题.属于难题.
![](http://thumb2018.1010pic.com/images/loading.gif)
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