已知二次函数
的图象如图所示,则
,
,
,
这四个式子中,值为正数的有( )
![](https://img.xkw.com/dksih/QBM/2022/10/19/3091109030305792/3091301000503296/STEM/61bf83a1711047509c5934e9593162a7.png?resizew=158)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac8b0eb4aa1cbe23125aa2f6d35337c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2d7ddd7ef3b6cde30018bc6a84b9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6413d5b2cc36e53b0701a7aea5298d19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f131343bf0dbf9172a86d4e71d448caf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb14e2fe3859d5aecf636054ee65d77.png)
![](https://img.xkw.com/dksih/QBM/2022/10/19/3091109030305792/3091301000503296/STEM/61bf83a1711047509c5934e9593162a7.png?resizew=158)
A.4个 | B.3个 | C.2个 | D.1个 |
更新时间:2022-10-19 22:50:53
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【推荐1】抛物线经过点
和
,则下列结论正确的是( )
A.![]() | B.函数的最小值一定小于![]() |
C.![]() | D.抛物线的对称轴可能是直线![]() |
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【推荐2】如图所示,二次函数
的图象经过点
,其对称轴为直线
,有下列结论:①
;②
;③
;④
.其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828496010870784/2837886926807040/STEM/c54ed419cf894fdba6ad2a6ed8b874c0.png?resizew=95)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a31d3ff0489fd0dec060f5f1cc30117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbbcf3f7721240b8d2161f8c66a0fcf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661d5d8b2344d1ad2b7bf1490b16191b.png)
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828496010870784/2837886926807040/STEM/c54ed419cf894fdba6ad2a6ed8b874c0.png?resizew=95)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,已知二次函数
(a、b、c为常数,且
)的图象顶点为
,经过点
;有以下结论:①
;②
;③
;④
,y随x的增大而减小;⑤对于任意实数t,总有
,其中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35a78489a7972a645bc015106e99b9f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ea1f5bdd213c7c3a571b4c38850bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41d01c32cf82622d2832bdd2f2d1f6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661d5d8b2344d1ad2b7bf1490b16191b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5f37fc299a64e38a724395c0edfc4b.png)
A.2个 | B.3个 | C.4个 | D.5个 |
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【推荐2】如图,二次函数
的图象与x轴正半轴交于点B,与y轴正半轴交于点C,且
.以下几个结论:①
:②
;③
;④
;⑤
;其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897976459075584/2937543811080192/STEM/4fbc7bd1-a95a-4018-b46e-e73444779b76.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6715ee8b9ede10b6db9f09177345ffd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16de2d7f06346a0fc6b5d6822e746237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd2336e50c0afb3e8e73a6ea9070ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e7ef804eeb23618fbf91ead47587f2.png)
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897976459075584/2937543811080192/STEM/4fbc7bd1-a95a-4018-b46e-e73444779b76.png?resizew=162)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】关于x的方程ax2+bx+c=0(a≠0)的两个根为﹣5和1,则抛物线y=ax2+bx+c(a≠0)的对称轴是( )
A.x=﹣4 | B.x=﹣3 | C.x=﹣2 | D.x=﹣1 |
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【推荐2】关于二次函数
,下列描述正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fff76456e4080c41c51661171c66f.png)
A.该函数图象的顶点坐标为![]() | B.该函数图象的对称轴在y轴的左侧 |
C.该函数图象与x轴有两个交点 | D.当![]() |
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