老师出示了小黑板上的题目后(如图),小华说:过点
;小彬说:过点
;小明说:
;小颖说:抛物线被
轴截得的线段长为2.你认为四人的说法中,正确的有( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c3a2f5b0702ea9fbb9dc8904579737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238f0ea276a00ae8d681ce00cc11c8ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
已知抛物线![]() ![]() ![]() ![]() |
A.1个 | B.2个 |
C.3个 | D.4个 |
更新时间:2019-07-08 19:06:11
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【知识点】 y=ax²+bx+c的图象与性质解读
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【推荐1】在平面直角坐标系中,正方形
、
、
……;按如图的方式放置,点
、
、
……
在直线
,点
、
、
……
在x轴上.抛物线
过点
、
,且顶点在直线
上,抛物线
过点
、
,且顶点在直线
上,……按此规律,抛物线
过点
、
,且顶点也在直线
上,抛物线
的顶点坐标为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/af4b7d45-0b1a-470f-9301-6e1df7d882b4.png?resizew=253)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
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A.![]() | B.![]() |
C.![]() | D.![]() |
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名校
【推荐2】已知二次函数y=
﹣3x+4.当a≤y≤b时.自变量x恰好满足a≤x≤b.现有下列说法:①二次函数图象的顶点坐标为(2.1);②当y≤b时.则a≤x≤b;③二次函数图象一定经过A(a.b)和B(b.b);④b=4或
.其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd22bf2d495d29e0eac2f02d2306a0cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
A.①② | B.②④ | C.①④ | D.②③④ |
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