已知二次函数
(
,
,
是常数,
)的
与
的部分对应值如下表:
下列结论:
①![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
②当
时,
的值随
的增大而减小
③方程
有两个不相等的实数根
④当
时,函数有最小值-6
其中,正确结论的序号是______ (把所有正确结论的序号都填上)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() | -5 | -4 | -2 | 0 | 2 |
![]() | 6 | 0 | -6 | -4 | 6 |
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778a49b7d25560e4785cfd983c06cb71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
③方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9993a6c38829d517800df946c60f3991.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
其中,正确结论的序号是
20-21九年级上·山东泰安·期末 查看更多[5]
山东省泰安市肥城市2020-2021学年九年级上学期期末数学试题山东省泰安市新泰市2022-2023学年九年级上学期期中数学试题(已下线)山东省济南市高新区2022-2023学年九年级上学期期末数学试题变式题11-152023年山东省泰安市泰山实验中学初中学业水平数学模拟预测题2023年山东省泰安市泰山学院附中中考数学模拟预测题
更新时间:2021-01-28 21:33:14
|
【知识点】 待定系数法求二次函数解析式解读
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