已知二次函数y=ax2+bx+c(a≠0)的图象如图所示有下列4个结论:①abc>0;②b<a+c;③4a+2b+c>0;④a+b>m(am+b)(m≠1的实数),其中正确结论的个数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/1fb67c38-380d-4b82-a953-4691342855fb.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/1fb67c38-380d-4b82-a953-4691342855fb.png?resizew=135)
A.0 | B.1 | C.2 | D.3 |
更新时间:2018-12-26 11:20:54
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【知识点】 根据二次函数的图象判断式子符号解读
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单选题
|
适中
(0.65)
【推荐1】如图是二次函数
图象的一部分,图象过点
,对称轴为直线
,给出四个结论:①
;②
;③
;④若点
为函数图象上的两点,则
.其中正确结论是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/644e1be9-12d3-4f56-b4fc-fe66aa297946.png?resizew=154)
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A.①②④ | B.①④ | C.①③④ | D.②④ |
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单选题
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适中
(0.65)
【推荐2】如图,抛物线
经过点
,且对称轴为直线
,其部分图象如图所示.下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641640506359808/2643765489582080/STEM/926be42249204d02bff25b6d8f5e48a0.png?resizew=189)
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![](https://img.xkw.com/dksih/QBM/2021/1/22/2641640506359808/2643765489582080/STEM/926be42249204d02bff25b6d8f5e48a0.png?resizew=189)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
您最近一年使用:0次