如图是抛物线
图象的一部分,抛物线的顶点是A,对称轴是直线
,且抛物线与x轴的一个交点为
;直线AB的解析式为
,下列结论:①
;②
;③方程
有两个不相等的实数根;④抛物线与x轴的另一个交点是
;⑤当
时,则
,其中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/b2533d49-5daa-47b5-ad3a-a7901a9ce4a5.png?resizew=186)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108829ddd88def33775f3add48fbb577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf13a0d8d007747742450267cb687c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa285de4d015f208441ffe9a84bbd780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e904bcf8e42d71e70d77239bff84e4a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da45e190edb2230c9b6495647954d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/b2533d49-5daa-47b5-ad3a-a7901a9ce4a5.png?resizew=186)
A.①② | B.①③⑤ | C.①④ | D.①④⑤ |
更新时间:2021-04-11 20:25:04
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【推荐1】二次函数y=ax2+bx+c(a≠0)的大致图象如图所示,顶点坐标为(1,﹣4a),点A(4,y1)是该抛物线上一点,若点D(x2,y2)是抛物线上任意一点,有下列结论:①4a﹣2b+c>0;②若y2>y1,则x2>4;③若0≤x2≤4,则0≤y2≤5a;④若方程a(x+1)(x﹣3)=﹣1有两个实数根x1和x2,且x1<x2,则﹣1<x1<x2<3.其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/5fbb25bf-2f47-4307-b0a8-2470dd7523ba.png?resizew=134)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/5fbb25bf-2f47-4307-b0a8-2470dd7523ba.png?resizew=134)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】已知抛物线
是常数
开口向下,过
,
两点,且
下列四个结论:
若
,则
;
若
时,则
;
若点
,
,在抛物线上,
,且
,则
;
当
时,关于
的一元二次方程
必有两个不相等的实数根.
如果
,
,那么当
时,直线
与该二次函数有一个公共点,则
.其中结论正确的个数有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cda29b26c71870187a1a1d3a79592209.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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