11-12高二下·湖北省直辖县级单位·期中
1 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cb58517869d4941d14266a9297095a.png)
,函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9dfb1b139b45548641e49390e97029.png)
(I)当
时,求函数
的表达式;
(II)若
,且函数
在
上的最小值是
,求
的值;
(III)对于(II)中所求的
值,若函数
,
,恰有三个零点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cb58517869d4941d14266a9297095a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aebf62d230cbee1781de6c1d73a7ff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9dfb1b139b45548641e49390e97029.png)
(I)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
(II)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(III)对于(II)中所求的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0654ea0fdf996d80d0f4db9a4bff174d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
2012高二上·湖北省直辖县级单位·学业考试
解题方法
2 . 已知
,在
与
时,都取得极值.
(1)求
的值;
(2)若
都有
恒成立,求c的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b269dce1ae3396d2afc82a91dc6f97ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e347b2b13e28b090ba15607492546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e5e0263aa91401efe21b84331ed6d7f.png)
您最近一年使用:0次