如图,抛物线y=ax2+bx+c(a≠0)与x轴交于点A、B,顶点为C,对称轴为直线x=1,给出下列结论:①abc>0;②若点C的坐标为(1,2),则△ABC的面积可以等于2;③M(x1,y1),N(x2,y2)是抛物线上两点(x1<x2),若x1+x2>2,则y1>y2; ④若抛物线经过点(3,﹣1),则方程ax2+bx+c+1=0的两根为﹣1,3.其中正确结论的序号为_________________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/07868bfc-f4a8-4e60-b807-4518c1a3a8f4.png?resizew=142)
更新时间:2022-04-13 09:27:57
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【推荐1】定义:在平面直角坐标系中,我们将横、纵坐标都是整数的点称为“整点”.若抛物线y=ax2﹣2ax+a+3与x轴围成的区域内(不包括抛物线和x轴上的点)恰好有8个“整点”,则a的取值范围是_____ .
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【推荐1】二次函数
(
、
、
为常数,
)中的
与
的部分对应值如下表:
当
时,下列结论中一定正确的是______ (填序号即可).
①
;
②当
时,
的值随
值的增大而增大;
③当
时,关于
的一元二次方程
的解是
,
;
④一元二次方程
有两个相等的实根,则
.
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当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8610232c77741a37463feba1a66c94.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aff29c8a6b12deddb514c9e92d92c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4049b329e8cf711663e050e0dc9cdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204e5160ff110a19878e4fae639319e4.png)
④一元二次方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae6b1aae5d2263a96fbfe8c0e6e4ff91.png)
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【推荐2】已知二次函数
的图像与
轴交于不同两点,与
轴的交点在
轴正半轴,它的对称轴为直线
.有以下结论:①
,②
,③抛物线上有两点
和
,若
,且
,则
,④设
,
是方程
的两根,若
,则
.其中正确的结论是______ (填入正确结论的序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df7fcf82e3fac415783957d0f17448f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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【推荐1】二次函数
的图像与
轴交于点
,与
轴的交点为
,对称轴为直线
.下列四个结论:
(1)
;
(2)过点
平行于
轴的直线与抛物线有唯一的公共点;
(3)若
,关于
的不等式
的解集为
;
(4)若
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,
在该抛物线上,当实数
时,
.
其中正确的结论是______ .
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(1)
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(2)过点
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(3)若
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(4)若
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其中正确的结论是
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【推荐2】如图,已知抛物线
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与x轴交于A,B两点,与y轴交于点C.______ ;
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(2)点P为L上在第一象限内的一点,过点P作直线
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