名校
1 . 已知关于x的不等式
(a>0).
(1)当
时,求此不等式的解集;
(2)若此不等式的解集为R,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128802456bed1eea29d5a4648bbc2059.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec62f2635e41acdbfbe10869b926e4c6.png)
(2)若此不等式的解集为R,求实数a的取值范围.
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2017-06-16更新
|
434次组卷
|
7卷引用:2016届湖南省株洲市二中高三上学期第二次月考理科数学试卷
解题方法
2 . 设函数
.
(1)当
,
时,求使
的
取值范围;
(2)若
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c30cba8980f10c3a9870bd6ec84269.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86304c3e26200299a0480641525a283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28280ea1a2aabb7f4d1f7fa6f44a7e8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963944f56ec874fccc3282b0d3ff941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f2416d1f75a45a314331146550832e.png)
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