名校
解题方法
1 . 已知命题“
,都有不等式
恒成立”是真命题.
(1)求由实数
的所有取值组成的集合
;
(2)设
,若
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96b743603ab1c10330622f16db78dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e31f3af819e048dc3ac0b63347a6fa8.png)
(1)求由实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6398809dab8b30b5dab68c2bc64ee34b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b05d2be27e8f53e4de3071846dffb41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
名校
解题方法
2 . 若不等式
的解集是
.
(1)解不等式
;
(2)当
的解集为
时,求b的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930a579ddfca10913b201cd03a2eedcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b05849c5aa6777c65d0035f08ad96e.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383e0cc4ef5dc56a26a863f71bfce1f9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bccf813015e921bfc31a9f9d5c84698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
您最近一年使用:0次
名校
3 . 已知关于
的不等式
的解集是R,则实数
的取值范围是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2426d72fe6b3551a24af366fd25a9ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次