名校
1 . 已知不等式
的解集为
,则下列结论正确的个数是( )
(1)
;
(2)当
时,函数
的图象与
轴没有公共点;
(3)当
时,抛物线
的顶点在直线
的上方;
(4)如果
且
,则
的取值范围是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae6c08e4c2f5db9a595dcdbd99f9896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200849ce71f53c0321506e27de437b8d.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa285de4d015f208441ffe9a84bbd780.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82b212ffece98b7918f74d67de4e4c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e136e7637543c8ae92c8dcd55b31924.png)
(4)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170932c0d6156799d81b12a2748983ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee50e7b3833a7b89dc386b567ddd910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e64cdd2f1be2d3fcac5f838a0d9371.png)
A.1 | B.2 | C.3 | D.4 |
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A.1 | B.2 | C.3 | D.4 |