已知抛物线
(a,b,c是常数,
)经过点
,有下列结论:①
;②当
时,y随x的增大而增大;③关于x的方程
有两个不相等的实数根.其中正确结论是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15754faea9b1e2c79d152ffc46026335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0949ce24c868813dfba767b6fb277538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9acf916e1b307979c03529ad4bc880.png)
更新时间:2023-01-30 14:07:01
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【推荐2】如图:已知二次函数
过
,对称轴为直线
.并且二次函数与x轴的一个交点位于0和1之间;①
;②
;③
的最大值为3;④对于任意实数t,一定有
.上述结论正确的是________ (填序号)
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【推荐1】二次函数的图象如图所示,给出四个结论:①abc>0;②4a﹣2b+c>0;③对于任意实数m,有
;④
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【推荐2】二次函数
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与函数值y的部分对应值如下表:
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和3是关于x的方程
的两个根;③
.则所有正确结论的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
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x | … | 0 | 1 | 2 | |||
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【推荐2】函数y=2x2﹣3x+1与y轴的交点坐标为_____ ,与x轴的交点的坐标为____ ,_____ .
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