如图,在4×4的网格中,每一个小方格都是边长为1的小正方形,每个小正方形的顶点称为格点,以O为坐标原点建立如图所示的平面直角坐标系.若抛物线y=x2+bx+c的图象至少经过图中(4×4的网格中)的三个格点,并且至少一个格点在x轴上,则符合要求的抛物线一定不经过的格点坐标为( )
![](https://img.xkw.com/dksih/QBM/2019/10/20/2316262513713152/2317916710510592/STEM/340dfef99f7f4e0cb8c18e3d1f97778d.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/2019/10/20/2316262513713152/2317916710510592/STEM/340dfef99f7f4e0cb8c18e3d1f97778d.png?resizew=135)
A.(1,3) | B.(2,3) | C.(1,4) | D.(2,4) |
19-20九年级上·浙江金华·阶段练习 查看更多[3]
更新时间:2019-10-22 22:36:31
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【知识点】 待定系数法求二次函数解析式解读
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单选题
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适中
(0.65)
【推荐1】过
,
,
三点的抛物线的顶点坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d13c137070f033e68ee0efb3e6a9652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d9e7504180fdc311d80eff43a960d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69df9ca048d06ff80408af39cd1b9b55.png)
A.(1,2) | B.(1,![]() | C.(-1,5) | D.(2,![]() |
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单选题
|
适中
(0.65)
【推荐2】已知抛物线
(a,b,c是常数),
,下列四个结论:①若抛物线经过点
,则
;②若
,则方程
一定有根
;③抛物线与x轴不一定有两个不同的公共点;④点
,
在抛物线上,若
,则当
时,
.其中,正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
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A.4个 | B.3个 | C.2个 | D.1个 |
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