二次函数
(
,
,
是常数,
)的自变量
与函数值
的部分对应值如表:
且当
时,与其对应的函数值
,有下列结论:①
;②
;③
和3是关于
的方程
的两个根;④
.其中,正确结论的个数是( )
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
… | 0 | 1 | 2 | … | |||
… | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c98a7f3a8bf384b1dfc1d34aebd46d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a4480988244a9d04ec293975db2cc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae6b1aae5d2263a96fbfe8c0e6e4ff91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9489d1eef2bfbb7095fdf86d3601f574.png)
A.1 | B.2 | C.3 | D.4 |
更新时间:2024-05-11 08:35:59
|
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【推荐2】关于二次函数
,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f30822735aa825f0e0f4a6496b020ec2.png)
A.图象开口向下 | B.图象经过点![]() |
C.图象的对称轴是直线![]() | D.最小值是![]() |
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名校
【推荐1】用“描点法”画二次函数
的图象时,列了如下表格:
根据表格上的信息回答问题:该二次函数
在
时,
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
x | … | ![]() | ![]() | 0 | 1 | 2 | … |
y | … | ![]() | ![]() | ![]() | ![]() | ![]() | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】将函数
是常数,
的图象向上平移,平移后函数的图象与
轴相交于点
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf408846c4b9509a441864dfab83e69.png)
.则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae04a830002929b8b75a1f486ef3a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02855b62bde08d08ebf76e466aeea1ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d49e11ddee82874bdf5d155aa340dc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf408846c4b9509a441864dfab83e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5140fd08693355e89abeb26c5e1658cd.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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【推荐1】把二次函数
的图象向上平移2个单位长度,若平移后所得抛物线与x轴有且只有一个公共点,那么m的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ecf0250d8dc96d8ea7ac9db679abecb.png)
A.![]() | B.![]() | C.2 | D.1 |
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【推荐2】已知二次函数
(
是常数,
),当
时,
,若此一元二次方程有两个不相等的实数根,则该二次函数
的图象可能是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40fe401db356f2d6e9b7adc9a19d8fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a7df955fc17e92fd86302f8c34664a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13fa32c1e926f40a0722d106563777ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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