在平面直角坐标系中,△AOB的位置如图所示,已知∠AOB=90°,AO=BO,点A的坐标为(-3,1).
(1)求点B的坐标;
(2)求过A、O、B三点的抛物线的解析式;
(3)设点B关于抛物线的对称轴
的对称点为B1,求△AB1B的面积.
(1)求点B的坐标;
(2)求过A、O、B三点的抛物线的解析式;
(3)设点B关于抛物线的对称轴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/2019/3/30/2171637503238144/2174457130024960/STEM/8cb760317e8c47ea9f450514360ded53.png?resizew=167)
更新时间:2019-04-03 14:07:16
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【知识点】 面积问题(二次函数综合)
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【推荐1】如图1,抛物线y=ax2+bx﹣8与x轴交于A(2,0),B(4,0),D为抛物线的顶点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/0b87e40e-61cc-43aa-9132-69407bcb27b5.png?resizew=675)
(1)求抛物线的解析式;
(2)如图2,若H为射线DA与y轴的交点,N为射线AB上一点,设N点的横坐标为t,△DHN的面积为S,求S与t的函数关系式;
(3)如图3,在(2)的条件下,若N与B重合,G为线段DH上一点,过G作y轴的平行线交抛物线于F,连接AF,若NG=NQ,NG⊥NQ,且∠AGN=∠FAG,求F点的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/0b87e40e-61cc-43aa-9132-69407bcb27b5.png?resizew=675)
(1)求抛物线的解析式;
(2)如图2,若H为射线DA与y轴的交点,N为射线AB上一点,设N点的横坐标为t,△DHN的面积为S,求S与t的函数关系式;
(3)如图3,在(2)的条件下,若N与B重合,G为线段DH上一点,过G作y轴的平行线交抛物线于F,连接AF,若NG=NQ,NG⊥NQ,且∠AGN=∠FAG,求F点的坐标.
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【推荐2】如图,已知直线
与抛物线
相交于
,
两点.
![](https://img.xkw.com/dksih/QBM/2020/5/26/2471121635467264/2471226774487040/STEM/79c86e8bb54b435d8da0189e946a7e9a.png?resizew=257)
![](https://img.xkw.com/dksih/QBM/2020/5/26/2471121635467264/2471226774487040/STEM/119377c0e88b49f0bc39481b022dba70.png?resizew=246)
(1)求抛物线的解析式.
(2)在直线
下方的抛物线上求点
,求
的面积等于20.
(3)若
在抛物线上,作
轴于点
,若
和
相似,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea22b8a61544a8dc0bc65cb440ecd5b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53be61cd85ec86aabd164cae0265246b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18edf403d3f6b6598f76ea13aa362033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73ceab553c10beee74d3f4a9039bb2b8.png)
![](https://img.xkw.com/dksih/QBM/2020/5/26/2471121635467264/2471226774487040/STEM/79c86e8bb54b435d8da0189e946a7e9a.png?resizew=257)
![](https://img.xkw.com/dksih/QBM/2020/5/26/2471121635467264/2471226774487040/STEM/119377c0e88b49f0bc39481b022dba70.png?resizew=246)
(1)求抛物线的解析式.
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53502463cc76201000e02df314e58769.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e7c6d54b0d73fa8d3af7f2a4d7f049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/847f3efe1ed0442eeaef93c89439c581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6765a87bcc2b6d44aabdee9af73e6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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