1 . 已知函数
和
(
为常数)的图象在
处有公切线.
(Ⅰ)求实数
的值;
(Ⅱ)求函数
的极大值和极小值;
(Ⅲ)关于x的方程
由几个不同的实数解?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d7193d4a969593cd82d058d7f51aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d3dd49b36b0bbb810bba820f5ff2b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
(Ⅰ)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(Ⅱ)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3c2be7482719651bcf491949681e05.png)
(Ⅲ)关于x的方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8bfb563f79688d136e0cb958b5153c.png)
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12-13高二下·四川·阶段练习
2 . 已知函数
.
(1)求
的单调区间;
(2)当
时,判断
和
的大小,并说明理由;
(3)求证:当
时,关于
的方程:
在区间
上总有两个不同的解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c599bf5af19e4603956e98c5650dbd4f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17988cb33273869bda17fa256f968230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4886e28e9ecd40f7edd25f25bde28453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2709ca478fb15ea08e8aa55328eae8e6.png)
(3)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ccc2e60c40781eca527195c5a721169.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a00be02f89bb28b54fadb4e0c27e13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae3777d65a4e4a642c6772a1870c8b9.png)
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解题方法
3 . 已知函数
,其中
.
(1)若
在区间
上为增函数,求
的取值范围;
(2)当
时,(ⅰ)证明:
;(ⅱ)试判断方程
是否有实数解,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0473ffcca997f603b285fffbbfdfe39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9210e75c35fb455d0446eb7ddba7d79c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f6d1efa04a6bc0ec188ced80b9a2cd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d69d8064f04b7682db1a7b39bde673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10494773aa043788e0cea058580580.png)
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