如图所示,二次函数y=ax2+bx+c的图象与x轴交于A,B两点,与y轴交于点C.对称轴为直线x=l,直线y=﹣x+c与抛物线交于C,D两点,D点在x轴下方且横坐标小于3,现有下列结论:①2a+b+c>0;②a﹣b+c<0;③x(ax+b)<a+b;④a<﹣1.其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/2021/12/22/2877774682267648/2884251379712000/STEM/22a364d4-21fe-4ec9-9996-5199f28c9557.png?resizew=237)
![](https://img.xkw.com/dksih/QBM/2021/12/22/2877774682267648/2884251379712000/STEM/22a364d4-21fe-4ec9-9996-5199f28c9557.png?resizew=237)
A.①②③ | B.①②④ | C.②③④ | D.①③④ |
更新时间:2021-12-31 10:07:21
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【推荐1】在平面直角坐标系
中,直线
经过点
,且直线
轴.若直线
与二次函数
的图像交于A,B两点,与二次函数
的图像交于C,D两点,其中
,
为整数.若
,
.则
的值为( )
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A.9 | B.11 | C.16 | D.24 |
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【推荐2】题目:“已知抛物线
,点
,
.若该抛物线与线段
只有一个公共点,求a的取值范围.”对于其答案,甲答:
,乙答:
,丙答:
,则正确的是()
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A.只有甲答的对 | B.甲、丙答案合在一起才完整 |
C.乙、丙答案合在一起才完整 | D.三人答案合在一起才完整 |
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【推荐1】二次函数
的部分图象如图所示,与y轴交于
,对称轴为直线
.下列结论:①
;②
;③
和
在该二次函数的图象上,则当实数
时,
;④方程
(
,k为常数)的所有根的和为4,其中正确结论是( ).
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A.1 | B.2 | C.3 | D.4 |
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【推荐2】抛物线
(
为常数,
)经过点
,对称轴为直线
,顶点在第三象限.有下列结论:①
;②
;③当
时(
为常数),
.其中,正确结论的个数是( )
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A.0 | B.1 | C.2 | D.3 |
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【推荐1】已知抛物线
(
,
,
是常数,
,
)对称轴为
,且经过点
.下列结论:
①
;
②
;
③关于
的方程
恰好有两个相等的实数根,则
.
其中,正确的个数是( )
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①
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②
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③关于
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f5ec9b1d71f22c6e3b339a9b3738ab.png)
其中,正确的个数是( )
A.3 | B.2 | C.1 | D.0 |
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【推荐2】已知二次函数y=ax2+bx+c的图象如图所示,它与x轴的两个交点分别为(﹣1,0),(3,0).对于下列命题:①2a+b=0;②abc<0;③b2﹣4ac>0;④8a+c>0.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/ddeb708d-b07a-48d8-9fa4-c249a997782c.png?resizew=116)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/ddeb708d-b07a-48d8-9fa4-c249a997782c.png?resizew=116)
A.3个 | B.2个 | C.1个 | D.0个 |
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