如图,在平面直角坐标系中,抛物线
与x轴交于点D、点E,过该函数顶点A与x轴平行的直线交抛物线
于点B、点C,若
,那么
和
需满足关系( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84960e9e6797f0f3a351b9198184696c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8939d4edba091e87b4ea938f7c4ce1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936c74c9a7edc81c037f4ea795d130bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-05-04 11:16:39
|
【知识点】 y=ax²+bx+c的图象与性质解读
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适中
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【推荐1】已知抛物线y=ax2+bx+c(a<0)过A(﹣3,0),B(1,0),C(﹣5,y1),D(﹣2,y2)四点,则y1与y2的大小关系是( )
A.y1>y2 | B.y1=y2 | C.y1<y2 | D.不能确定 |
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单选题
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适中
(0.65)
【推荐2】如图,抛物线y=ax2+bx+c与x轴正半轴交于A,B两点,与y轴负半轴交于点C.若点B(4,0),则下列结论中,正确的个数是( )
①abc>0;
②4a+b>0;
③M(x1,y1)与N(x2,y2)是抛物线上两点,若x1<x2<0,则y1<y2<0;
④若抛物线的对称轴是直线x=3,k为任意实数,则a(k﹣3)(k+3)≤b(3﹣k);
⑤若AB≥3,则4b+3c>0.
![](https://img.xkw.com/dksih/QBM/2022/4/30/2969374422056960/2974145177788416/STEM/b3359a46-318f-45df-af42-3899f933d7d8.png?resizew=159)
①abc>0;
②4a+b>0;
③M(x1,y1)与N(x2,y2)是抛物线上两点,若x1<x2<0,则y1<y2<0;
④若抛物线的对称轴是直线x=3,k为任意实数,则a(k﹣3)(k+3)≤b(3﹣k);
⑤若AB≥3,则4b+3c>0.
![](https://img.xkw.com/dksih/QBM/2022/4/30/2969374422056960/2974145177788416/STEM/b3359a46-318f-45df-af42-3899f933d7d8.png?resizew=159)
A.5 | B.4 | C.3 | D.2 |
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