已知二次函数
对任意实数
,都有
恒成立.
(1)证明:
;
(2)若
,求
的表达式;
(3)在题(2)的条件下设
,若
图象上的点都位于直线
的上方,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3ad8b3c14750f64d80ed67c3b293c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed27ece6f8008b072f3b33dbde52352.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249a976e88133f3b3733f09137cf5c42.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a431537df789febf4bc45e3dc23cefaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)在题(2)的条件下设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52440ed3d0de29c58b15c4e5c094681.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856c83e47aaab6b0d3ef0823bd082c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2017-09-14 16:40:13
|
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