如图,已知二次函数y=ax2+bx+c(a≠0)的图象与x轴交于点A(-1,0),与y轴的交点B在(0,-2)和(0,-1)之间(不包含这两点),对称轴为直线x=1.在下列结论中:①abc>0;②16a+4b+c<0;③4ac-b2<8a;④
<a<
;⑤b<c.正确结论的个数为( )
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991242141040640/2995060786462720/STEM/c16df69a-0c1d-44a1-a501-57e57d13f8b8.png?resizew=214)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d0e7bfbd56fe73dfe04c04da749d942.png)
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991242141040640/2995060786462720/STEM/c16df69a-0c1d-44a1-a501-57e57d13f8b8.png?resizew=214)
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更新时间:2022-06-05 23:29:40
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【推荐1】已知抛物线
与
轴交于
,
两点,将这条抛物线的顶点记为
,连接
,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2424a5b449cd258d39765ba1167f3b98.png)
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【推荐2】在平面直角坐标系中,如果一个点的横坐标与纵坐标相等,则称该点为“雁点”.例如
,
……都是“雁点”.若抛物线
上有且只有一个“雁点”
,该抛物线与
轴交于
、
两点(点
在点
的左侧).当
时,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29343388ca8b33dc98325e65382b38a0.png)
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【推荐1】二次函数
的部分图象如图,图象过点(-1,0),对称轴为直线x=2,下列结论:①4a+b=0;②9a+c>3b;③当x>-1时,y的值随x值的增大而增大:④当函数值y<0时,自变量x的取值范围是
或
;⑤8a+b+2c>0,正确的结论有( )
![](https://img.xkw.com/dksih/QBM/2021/1/10/2632998300704768/2641424058679296/STEM/5f195f69-1e62-4bee-91f3-be7e3d5fc095.png?resizew=138)
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![](https://img.xkw.com/dksih/QBM/2021/1/10/2632998300704768/2641424058679296/STEM/5f195f69-1e62-4bee-91f3-be7e3d5fc095.png?resizew=138)
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【推荐2】已知抛物线
与
轴最多有一个交点,现有以下四个结论:①
;②关于
的方程
无实数根;③该抛物线的对称轴在
轴左侧;④
的最小值为3.其中,错误结论的个数为( ).
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【推荐1】二次函数
的部分图象如图所示,图象过点
,对称轴为直线
,下列结论:①
;②
;③若方程
的两根为
和
,且
,则
;④
,其中正确的结论有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6554ac3dff4a59833e407db887f6e6.png)
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A.①②③ | B.②③④ | C.①③④ | D.①②④ |
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【推荐2】二次函数
的图象如图所示,下列结论:①
;②
;③
;④
⑤若m为任意实数,则
其中正确结论有( )个.
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