如图,抛物线
)的对称轴是直线
,y并与x轴交于A,B两点,若
,则下列结论中:①
;②
;③
;④若m为任意实数,则
,正确的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/55305909-41bc-48fd-a7b8-cf3fa61cf372.png?resizew=192)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/463319053d27fdb1185bf14fa9e72cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b8394dc002ee4640abc8b6a96df966e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ad655e395dc7cda20c6ae11f4a5e890.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231282a60e9b336c79fa57552674b0c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/55305909-41bc-48fd-a7b8-cf3fa61cf372.png?resizew=192)
A.1 | B.2 | C.3 | D.4 |
更新时间:2023-02-27 21:58:23
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【推荐2】在下列函数图象上任取不同两点
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【推荐1】二次函数y=ax2+bx+c(a≠0)的图象如图,给出下列五个结论:
①3a+2b+c<0;
②3a+c<b2﹣4ac;
③方程2ax2+2bx+2c﹣4=0没有实数根;
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/182af4a0-50dc-4e5c-9578-1df5f0229ab1.png?resizew=144)
①3a+2b+c<0;
②3a+c<b2﹣4ac;
③方程2ax2+2bx+2c﹣4=0没有实数根;
④m(am+b)+b<a(m≠﹣1).
⑤若点(﹣8,y1),点(8,y2)在二次函数图象上,则y1<y2;
其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/182af4a0-50dc-4e5c-9578-1df5f0229ab1.png?resizew=144)
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【推荐2】如图是二次函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
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A.①②④ | B.①② | C.②③④ | D.③④ |
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【推荐1】二次函数
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;②
;③
;④
⑤若m为任意实数,则
其中正确结论有( )个.
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名校
【推荐2】如图是二次函数y=ax2+bx+c的图象,其对称轴为x=1,下列结论:①abc>0;②2a+b=0;③4a-2b+c<0;④若(-3,y1),(4,y2)是抛物线上两点,则y1<y2,其中结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/e02919ce-284a-48b2-a4c6-fc57a83ce54e.png?resizew=168)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/e02919ce-284a-48b2-a4c6-fc57a83ce54e.png?resizew=168)
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