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C(0,﹣1)之间(不包括这两点),对称轴为直线x=1,下列结论:①abc>0;②4a+2b+c>0;③4ac﹣b2<8a;④
;⑤b<c.其中含所有正确结论的选项是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504460b4da08352f1d08e8ce7744b9af.png)
![](https://img.xkw.com/dksih/QBM/2019/12/26/2363389218078720/2368257632862209/STEM/e8cbdaef927f41908e68b0cf3bd59efb.png?resizew=140)
更新时间:2020-01-03 19:43:45
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【推荐1】如果抛物线y=a
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【推荐2】已知二次函数
的图象过定点
,
,下列结论:
①当
时,该函数图象的顶点坐标为
;②该函数图象与x轴始终有两个不同的交点;③当
时,该函数在
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①当
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【推荐1】已知二次函数y=a(x+1)²-b (a≠0)的最小值是1,则a_____ b.(>,≥,<或≤)
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【推荐2】如下图抛物线
的图象交
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和点
,交
轴负半轴于点
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;②
;③
;④
其中正确的序号有________ .
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【推荐1】如图是二次函数
的图像,下列结论:①
;②
;③
;④
;⑤当
时,
,你认为其中不正确的是(填序号)_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
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【推荐2】如图是二次函数
图象的一部分,图象过点
,对称轴为直线
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;②
;③
;④
,其中正确的结论是______ .(填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
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