如图,已知二次函数y=ax2+bx+c(a≠0)的图象与x轴交于点A(﹣1,0),与y轴的交点B在(0,﹣2)和(0,﹣1)之间(不包括这两点),对称轴为直线x=1.下列结论:①abc>0;②4a+2b+c>0;③4ac﹣b2>8a;④
; ⑤b>c.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/84f627a3-bd20-49e2-b31d-d9917d1f3178.png?resizew=176)
其中含所有正确结论的选项是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504460b4da08352f1d08e8ce7744b9af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/84f627a3-bd20-49e2-b31d-d9917d1f3178.png?resizew=176)
其中含所有正确结论的选项是( )
A.①②③ | B.②③④ | C.①④⑤ | D.①③④⑤ |
2022·四川德阳·一模 查看更多[10]
2022年四川省德阳市广汉市九年级第一次诊断考试数学试题(已下线)专题22.31 二次函数与一元二次方程(培优篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(人教版)(已下线)2022年四川省广元市中考数学变式题6-10(已下线)2022年四川省广安市中考数学真题变式题6-10题湖南省长沙市中雅培粹学校2021-2022学年八年级下学期第三次月考数学试题(已下线)2022年四川省成都市中考数学真题变式题6-10题(已下线)专题5.34 二次函数与一元二次方程(培优篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(苏科版)(已下线)专题2.34 二次函数与一元二次方程(培优篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(北师大版)四川省德阳市中江县2023-2024学年九年级上学期期中数学试题福建省连江第三中学2023-2024学年九年级上学期月考数学试题
更新时间:2022-05-21 09:59:20
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【推荐1】已知二次函数
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C.![]() ![]() | D.![]() ![]() |
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【推荐2】如图,抛物线
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①当
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;③
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①当
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C.3个 | D.4个 |
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【推荐1】二次函数
的图象如图所示,其对称轴为直线
,与
轴的交点为
、
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;②
;③
;④当
为任意实数时,
;⑤
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/3229aff5-ff4f-480e-89ba-f8e5a510a59c.png?resizew=273)
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①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630bb948780be53bc73d9ddef875000.png)
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A.①②③④ | B.①③⑤ | C.②④⑤ | D.①③④ |
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;②
;③
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A.4 | B.3 | C.2 | D.1 |
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【推荐2】函数y=ax2+bx+c (a,b,c为常数,且a≠0)经过点(﹣1,0)、(m,0),且1<m<2,当x<﹣1时,y随x增大而减小,下列结论:①abc>0;②a+b<0;③若点A(﹣3,y1),B(3,y2)在抛物线上,则y1<y2;④方程ax2+bx+c-2=0必有两个不相等实数根;⑤c≤﹣1时,则b2﹣4ac≤4a.其中结论正确的有( )个
A.1个 | B.2个 | C.3个 | D.4个 |
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