如图,抛物线
与直线
相交于
,
两点,点C是抛物线的顶点.下列结论正确的个数( )
(1)
;(2)抛物线为:
;(3)当
时,代数式
的值是负数;(4)△ABC的面积为6
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/2463d134-d135-4b81-bdc6-b88a54eb61e5.png?resizew=184)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee5356f3b7d6e841eb98c2b04cad054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f19b11843421f6082d3aef4115ddd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93842cf36b1107534c3904d18ba3ae5c.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9620e97567191461f1a87aebb7b4f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b14deee0ddca0fbda8289fe46e88f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afeccf0358c02b53554a0f6d3dc33cbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e78f0b186b36a9ff1ca5285ff8944c2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/2463d134-d135-4b81-bdc6-b88a54eb61e5.png?resizew=184)
A.4个 | B.3个 | C.2个 | D.1个 |
更新时间:2022-03-23 14:41:02
|
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【推荐1】在平面直角坐标系中,O为原点,直线y=kx+b交x轴于A(﹣3,0),交y轴于B,且三角形AOB的面积为6,则k=( )
A.![]() | B.﹣![]() | C.﹣4或4 | D.﹣![]() ![]() |
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【推荐2】如图,在平面直角坐标系中,四边形
是矩形,点B的坐标是
,D是
的中点,
、
交于点E,函数
的图象过点B.E.且经过平移后可得到一个反比例函数的图象,则该反比例函数的解析式为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9bc13b02ca51f51cdbff9e6b0090535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65796f10847b045a7498c29f26fcbb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如果抛物线
经过点
,
和
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c87ab35d469e4649eb10b660c704aec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e5abf8d6d9b0f7206c81b85bf54f5b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4180c7f7bc8ccd47ccc466d8c6544656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa29afaff20d6110faa645b756fcdef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc6335b9a178f2a97ca5db6dc5d8fd8.png)
A.-4 | B.-2 | C.0 | D.1 |
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【推荐2】抛物线
交x轴于
,A两点,将
绕点A旋转
得到抛物线
,交x轴于另一点
;将
绕点
旋转
得到抛物线
,交x轴于另一点
;…,如此进行下去,形成如图所示的图像,则下列各点在图像上的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a3e51beb8d58a68f8446775b95e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1a9821a00b71f6b7d7a76d91b3f810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/25/23dcef36-dca0-4fa7-b3a4-e2dae31040fd.png?resizew=233)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图所示,在直角坐标系中,
,
,△ABC为等腰直角三角形,以A为位似中心,把△ABC按相似比1:2放大,放大后的图形记作
,则
的坐标为( )
![](https://img.xkw.com/dksih/QBM/2022/2/17/2918488595595264/2922674107490304/STEM/a3e87c4e-ab7f-4564-b66a-a01cfa68c9fc.png?resizew=241)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4617c61168e1cf0a6545a57b3de6f235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831fe9fb4e9d2d3a5d27d58afa684089.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://img.xkw.com/dksih/QBM/2022/2/17/2918488595595264/2922674107490304/STEM/a3e87c4e-ab7f-4564-b66a-a01cfa68c9fc.png?resizew=241)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】在平面直角坐标系中,点
到原点的距离是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7eb8d05dde58ff0013f917179812c5a.png)
A.3 | B.4 | C.5 | D.![]() |
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【推荐1】如图1,在△ABC中,
,E,F分别是边AC,BC上的动点,且
,D是AB的中点,连接DE,DF,EF,设
,
的面积为y,图2是y关于x的函数图象,则下列说法不正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/5/5/2972753091616768/2974799789875200/STEM/77994a3dce544bd19894d60c224919c0.png?resizew=295)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5eb7f052fe50daeaecb6acf0bf80006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96bc55510792f8bd30e1c0686609fe3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/5/2972753091616768/2974799789875200/STEM/77994a3dce544bd19894d60c224919c0.png?resizew=295)
A.![]() | B.![]() |
C.四边形CEDF的面积为2 | D.![]() |
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【推荐2】如图,在矩形ABCD中,AB=2cm,BC=4cm,对角线AC,BD相交于点O,点E,F分别从B,C两点同时出发,以1cm/s的速度分别沿B→C,C→D运动,点F运动到点D时停止,点E运动到点C时停止.设运动时间为t(单位:s),△OEF的面积为S(单位:cm2),则S与t的函数关系可用图象表示为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/19/fec58d29-c0de-497a-8a3e-e67308c8abb1.png?resizew=187)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/19/fec58d29-c0de-497a-8a3e-e67308c8abb1.png?resizew=187)
A.![]() | B.![]() | C.![]() | D.![]() |
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