如图所示,抛物线L:
(
)的对称轴为x=5,且与x轴的左交点为(1,0)则下列说法正确的有( )
①C(9,0);②b+c>-10;③y的最大值为-16a; ④若该抛物线与直线y=8有公共交点,则a的取值范围是a≤
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
①C(9,0);②b+c>-10;③y的最大值为-16a; ④若该抛物线与直线y=8有公共交点,则a的取值范围是a≤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/785741bb-5f18-4f63-b004-f094937356d5.png?resizew=167)
A.①②③④ | B.①②③ | C.①③④ | D.①④ |
20-21九年级上·福建福州·阶段练习 查看更多[2]
更新时间:2020-11-13 09:40:06
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【知识点】 二次函数图象与各项系数符号解读
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单选题
|
较难
(0.4)
名校
【推荐1】二次函数
的图象如图所示.对称轴是直线
,有以下结论;①
;②
;③
;④若抛物线上三点坐标为
,
,
,则
;⑤
,其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/2022/4/26/2970849260912640/2987860044193792/STEM/e3cced65c71645a38654a6c212bad5f5.png?resizew=193)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
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A.①②③ | B.②③④ | C.①③⑤ | D.②③⑤ |
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【推荐2】已知二次函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
的图象如图所示,以下结论:①
;②
;③
;④
;⑤若此函数的最大值为
,二次函数
的最大值为
,则
.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/2021/5/24/2728033455710208/2730755915137024/STEM/ab1da1e8-1c86-49bf-976f-8a4040240b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5bb89c3ad435f1ef59307b174105ed.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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