(1)解不等式
;(2)若不等式
的解集为R,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cec776301e7e793ceb94f9dd56d35ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2b9b4d5eed73c4b4147b5d6c4ec526.png)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435812274176/1619435812642816/STEM/40954c5e559b4f97a7ea32756ef43f9c.png)
更新时间:2017-02-08 10:13:30
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【知识点】 一元二次不等式
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解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐1】设命题
:存在实数
,
,使不等式
成立;命题
:对任意实数
,
,使
恒成立,若
和
均为假命题,求实数
的取值范围.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366a925eafa8ea3149d89fc60fc18286.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dfd0e1969675cd741a278cc11b5c4f2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45340678c2ec1bc8cd68c0a3a2ab8902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/917b258c62c1d203006413630bfaa05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
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解答题-问答题
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较易
(0.85)
解题方法
【推荐2】若函数
的定义域为R,求实数a的取值范围;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c41866a4f5eb816d601168178aa0c9.png)
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