名校
1 . 已知函数
,关于
的不等式
的解集为
,其中
,
为常数.给出下列四个结论:
①直线
是曲线
的一条切线;
②
;
③当
时,
的取值范围是
;
④要使
取唯一的值,仅当
.
其中,所有正确结论的序号是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe819909452c1edb8e1f0e3f1adc562.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce84901e2f29f740265e278be8e34de9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea69fb59dc615852a0d248675788d82e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a27c31d57a84a5928898de139cb40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b5b0840d90d0654e9bcb0f866ff10d.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51969fc1a8030cef11cab59267689e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a50188f84f379b3d0418c54cbade7d7.png)
④要使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acdc6e6a0e6584bea7deb91b0841fa28.png)
其中,所有正确结论的序号是
您最近一年使用:0次
名校
2 . 已知函数
,关于
的不等式
的解集为
,其中
,
为常数.给出下列四个结论:
①直线
是曲线
的一条切线;
②
;
③当
时,
的取值范围是
;
④要使
取唯一的值,仅当
.
其中,所有正确结论的序号是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f52ce8cf72216ea15e51aeedd2ae430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce84901e2f29f740265e278be8e34de9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea69fb59dc615852a0d248675788d82e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a27c31d57a84a5928898de139cb40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e413f39aa2a614aa4cb22fca820d9296.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51969fc1a8030cef11cab59267689e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a50188f84f379b3d0418c54cbade7d7.png)
④要使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acdc6e6a0e6584bea7deb91b0841fa28.png)
其中,所有正确结论的序号是
您最近一年使用:0次
解题方法
3 . 已知函数
.若关于x的不等式
的解集为
,则实数a的取值范围为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc607e94a69ece2009e5b94d3b892db7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ca5e984d5e14b4be18a5ee99f80a4f.png)
您最近一年使用:0次