解题方法
1 . 已知函数
.
(1)若函数
在点区间
处上为增函数,求a的取值范围;
(2)若函数
的图像在点x=e(e为自然对数的底数)处的切线斜率为3,且
时,不等式
在
上恒成立,求k的最大值;
(3)
时,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358d0f4725305a4ce248a49657644c66.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac472b9d6ece224b0bf0080810ab227.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232d1ce3ad14256b1543e6007ff1675d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37388fb5ecd6aa6a89245f715c64ef2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3368388525e30cb7179909b03184eb.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e738c6742d922e872491bd1c62ccdb94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80aa7e9fae0f192681bcaaa6ed894ea7.png)
您最近一年使用:0次
2 . 已知函数
,
,![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/0a9909c958c6408b98848ef5ba9ef0ef.png)
(Ⅰ)若函数
的图象在点
处的切线与直线
平行,且函数
在
处取得极值,求函数
的解析式,并确定
的单调递减区间;
(Ⅱ)在(Ⅰ)的条件下,如果对于任意的
,都有
成立,试求实数
的取值范围.
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/bde1d6cb542b49d1b7cca7f082f9e8f8.png)
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/8221f76d1d6f49b68b0affe18915b0b8.png)
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/0a9909c958c6408b98848ef5ba9ef0ef.png)
(Ⅰ)若函数
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/d04ea0897e414ddd8bc6d498a3b7983a.png)
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/1143376777c34ba48152780c746a28be.png)
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/be0b98b6c111401cb3566b15579219ff.png)
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/d04ea0897e414ddd8bc6d498a3b7983a.png)
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/43241d209d5440f6bec16ee5e3f549fe.png)
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/d04ea0897e414ddd8bc6d498a3b7983a.png)
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/d04ea0897e414ddd8bc6d498a3b7983a.png)
(Ⅱ)在(Ⅰ)的条件下,如果对于任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f769f8b3ab251c4b930ae9c36b2d86a.png)
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/a4ddafec357944f7a455093f2d8e8f20.png)
![](https://img.xkw.com/dksih/QBM/2016/5/13/1572635889983488/1572635896348672/STEM/1a9d2a87ca9c4d129945f82a844c74a5.png)
您最近一年使用:0次