如图,直线
与坐标轴交于A,G两点,经过B(2,0)、C(6,0)两点的抛物线y=ax2+bx+2与直线
交于A,D两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/e0d7ac98-b784-47c2-93d5-13342ccf9e85.png?resizew=590)
(1)求抛物线的解析式及点D的坐标;
(2)点M是抛物线上位于直线AD下方上的一个动点,当点M运动到什么位置时△MDA的面积最大?最大值是多少?
(3)在x轴上是否存在点P,使以A、P、D为顶点的三角形是直角三角形?若存在,直接写出满足条件的点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23bdd7fba7303e14ee8656e85fb6f64c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23bdd7fba7303e14ee8656e85fb6f64c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/29/e0d7ac98-b784-47c2-93d5-13342ccf9e85.png?resizew=590)
(1)求抛物线的解析式及点D的坐标;
(2)点M是抛物线上位于直线AD下方上的一个动点,当点M运动到什么位置时△MDA的面积最大?最大值是多少?
(3)在x轴上是否存在点P,使以A、P、D为顶点的三角形是直角三角形?若存在,直接写出满足条件的点P的坐标;若不存在,请说明理由.
2021·山东潍坊·一模 查看更多[3]
2021年山东省潍坊诸城市中考一模数学试题(已下线)专题02 二次函数与直角三角形问题-挑战2022年中考数学压轴题之学霸秘笈大揭秘江西省南昌市第十九中学2021-2022学年九年级第四次(3月)月考数学试题
更新时间:2022-03-01 13:30:21
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名校
【推荐1】如图,在平面直角坐标系中,抛物线
与
轴交于
,
两点,与
轴交于
点,连接
,
是直线
上方抛物线上一动点,连接
,交
于点
.其中
,
.
(1)求抛物线的解析式;
(2)求
的最大值;
(3)若函数
在
其中
范围内的最大值为
,最小值为
,且
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be86349e06431647f8e359d9bd07700.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9466d03bc916a9169eaf39863d59fceb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/6/0a61b4cf-e75a-4496-9e8a-bef4c78d2db0.png?resizew=183)
(1)求抛物线的解析式;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cdfc688e25f6c16a04bb092223e9127.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/288241c829258ce206821b264ac6a61a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d38c5ff6a4f92210813a39b61fbabbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffdbe4aef61b219830aae1a930d711c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
【推荐2】如图,已知二次函数图象的顶点坐标为C(1,0),直线
与该二次函数的图象交于A、B两点,其中A点的坐标为(3,4),B点在轴
上.
(1)求
的值及这个二次函数的关系式;
(2)P为线段AB上的一个动点(点P与A、B不重合),过P作
轴的垂线与这个二次函数的图象交于点E点,设线段PE的长为
,点P的横坐标为
,求
与
之间的函数关系式,并写出自变量
的取值范围;
(3)D为直线AB与这个二次函数图象对称轴的交点,在线段AB上是否存在一点P,使得四边形DCEP是平行四边形?若存在,请求出此时P点的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2016/9/29/1574245157314560/1574245163540480/STEM/b2040c21a2f948a8a107b1fd1b1118b7.png?resizew=62)
![](https://img.xkw.com/dksih/QBM/2016/9/29/1574245157314560/1574245163540480/STEM/1a98bd8384fc429a8a5f28141244449b.png?resizew=13)
(1)求
![](https://img.xkw.com/dksih/QBM/2016/9/29/1574245157314560/1574245163540480/STEM/f5833494ea654fbbb9959441647c22e1.png?resizew=17)
(2)P为线段AB上的一个动点(点P与A、B不重合),过P作
![](https://img.xkw.com/dksih/QBM/2016/9/29/1574245157314560/1574245163540480/STEM/61525d4edd4c46f295488bd5724e4310.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2016/9/29/1574245157314560/1574245163540480/STEM/c20a4090785b421ea4af66cecc0f3516.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2016/9/29/1574245157314560/1574245163540480/STEM/61525d4edd4c46f295488bd5724e4310.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2016/9/29/1574245157314560/1574245163540480/STEM/c20a4090785b421ea4af66cecc0f3516.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2016/9/29/1574245157314560/1574245163540480/STEM/61525d4edd4c46f295488bd5724e4310.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2016/9/29/1574245157314560/1574245163540480/STEM/61525d4edd4c46f295488bd5724e4310.png?resizew=12)
(3)D为直线AB与这个二次函数图象对称轴的交点,在线段AB上是否存在一点P,使得四边形DCEP是平行四边形?若存在,请求出此时P点的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/9/3a3e179a-9592-4fe0-a632-1294e3441f71.png?resizew=136)
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【推荐1】在平面直角坐标系中,已知
,
,且以
为直径的圆交y轴的正半轴于点C,过点C作圆的切线交x轴于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/f941034b-8011-44a7-9e33-b994afd1bbaf.png?resizew=214)
(1)求点C的坐标和过A,B,C三点的抛物线的析式;
(2)求点D的坐标:
(3)设平行于x轴的直线交抛物线于E,F两点,问:是否存在以线段
为直径的圆,恰好与x轴相切?若存在,求出该圆的半径,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/f941034b-8011-44a7-9e33-b994afd1bbaf.png?resizew=214)
(1)求点C的坐标和过A,B,C三点的抛物线的析式;
(2)求点D的坐标:
(3)设平行于x轴的直线交抛物线于E,F两点,问:是否存在以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐2】【旧知再现】圆内接四边形的对角 .
如图①,四边形
是
的内接四边形,若
,则
.
![](https://img.xkw.com/dksih/QBM/2019/12/10/2352197706153984/2353006471225344/STEM/eaa256e4487248e5872cf5d73e5aedbf.png?resizew=527)
【问题创新】圆内接四边形的边会有特殊性质吗?
如图②,某数学兴趣小组进行深入研究发现:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4008e236e35f983423251ac2bd94f89.png)
证明:如图③,作
,交
于点
.
∵
,
∴
,
∴
即
(请按他们的思路继续完成证明)
【应用迁移】如图④,已知等边
外接圆
,点
为
上一点,且
,
,求
的长.
如图①,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61fdbd1af47dd617db747d9eb8cf484b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967a1c427bfb4d6aa27c331c84d88ef1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://img.xkw.com/dksih/QBM/2019/12/10/2352197706153984/2353006471225344/STEM/eaa256e4487248e5872cf5d73e5aedbf.png?resizew=527)
【问题创新】圆内接四边形的边会有特殊性质吗?
如图②,某数学兴趣小组进行深入研究发现:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4008e236e35f983423251ac2bd94f89.png)
证明:如图③,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02fbbe04651b37e1520bb9a7bafed509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ac401eceadad9b2c485171ea2bddbc.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6ad4285ffe78cae4e3d642bab8d8b8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b0d8fd3d4c39b7560ef6f8156b4a5b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b04216df74b135ec1c7e682254528616.png)
【应用迁移】如图④,已知等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa6fd52f3933cbded9ce8c880b4a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5064f5ce5ac8428e277fd578da84ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
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【推荐1】在平面直角坐标系
中,抛物线
与
轴交于点
与
轴交于
,
两点(点
在点
的左侧),其中
,并且抛物线过点
.
![](https://img.xkw.com/dksih/QBM/2021/5/21/2726071977705472/2729480383586304/STEM/939107b2-3833-47aa-98d8-9a89dcd058ad.png)
(1)求抛物线的解析式;
(2)如图1,点
为直线
上方抛物线上一点,过
作
轴交
于点
.连接
,
,
,求四边形
面积的最大值及点
的坐标;
(3)如图2,将抛物线沿射线
方向平移得新抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad1402783057ee2be31c1fe65a6fcf5.png)
,是否在新抛物线上存在点
,在平面内存在点
,使得以
,
,
,
为顶点的四边形为正方形?若存在,直接写出此时新抛物线的顶点坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a4ba61e0fe0cb463581292835301f8.png)
![](https://img.xkw.com/dksih/QBM/2021/5/21/2726071977705472/2729480383586304/STEM/939107b2-3833-47aa-98d8-9a89dcd058ad.png)
(1)求抛物线的解析式;
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a8f2dc3dfdb2ac62cb3e68da8e5d80a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988ea01a10ba063e6470fb9efe65d42f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,将抛物线沿射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad1402783057ee2be31c1fe65a6fcf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611ec9980d0d4653b888f8274f49886d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐2】抛物线
(
)与
轴交于点A(-3,0),B(1,0)两点,与
轴交于点C(0,3),点P是抛物线上的一个动点.
(2)如图1,点P在线段AC上方的抛物线上运动(不与A,C重合),过点P作PD⊥AB,垂足为D,PD交AC于点E.作PF⊥AC,垂足为F,求△PEF的面积的最大值;
(3)如图2,点Q是抛物线的对称轴
上的一个动点,在抛物线上,是否存在点P,使得以点A,P,C,Q为顶点的四边形是平行四边形?若存在,求出所有符合条件的点P的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)如图1,点P在线段AC上方的抛物线上运动(不与A,C重合),过点P作PD⊥AB,垂足为D,PD交AC于点E.作PF⊥AC,垂足为F,求△PEF的面积的最大值;
(3)如图2,点Q是抛物线的对称轴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐1】如图,在平面直角坐标系中,直线
与x轴,y轴相交于A,B两点,点C的坐标是
.连接AC,BC.
![](https://img.xkw.com/dksih/QBM/2022/4/8/2953714910707712/2956612209270784/STEM/3c187fb0-08f2-4909-b968-bbe1941b1cf6.png?resizew=184)
(1)求过O,A,C三点的抛物线的函数表达式,并判断△ABC的形状;
(2)动点P从点O出发,沿OB以每秒2个单位长度的速度向点B运动;同时,动点Q从点B出发,沿BC以每秒1个单位长度的速度向点C运动.规定其中一个动点到达端点时,另一个动点也随之停止运动.设运动时间为ts,当t为何值时,
BPQ的面积最大?
(3)当抛物线的对称轴上有一点M,使以A,B,M为顶点的三角形是等腰三角形时,求出点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ac26e96e88e534c9e868452d5082ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee05fdbfca9281f1eb74e11c8144938.png)
![](https://img.xkw.com/dksih/QBM/2022/4/8/2953714910707712/2956612209270784/STEM/3c187fb0-08f2-4909-b968-bbe1941b1cf6.png?resizew=184)
(1)求过O,A,C三点的抛物线的函数表达式,并判断△ABC的形状;
(2)动点P从点O出发,沿OB以每秒2个单位长度的速度向点B运动;同时,动点Q从点B出发,沿BC以每秒1个单位长度的速度向点C运动.规定其中一个动点到达端点时,另一个动点也随之停止运动.设运动时间为ts,当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)当抛物线的对称轴上有一点M,使以A,B,M为顶点的三角形是等腰三角形时,求出点M的坐标.
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较难
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【推荐2】已知x轴上有一个点A1(m,0)(0<m<1),现操作如下:
若将点A1关于点(1,0)对称得到点A2(x2,0),将点A2关于点(2,0)对称得到点A3(x3,0);…将点An关于点(n,0)对称得到点An+1(x n+1,0).把经过点A1,A2的抛物线记作y1,其顶点记为B1;把经过A2,A3的抛物线记作y2,其顶点记为B2;…;把经过点An,An+1的抛物线记作yn,其顶点记为Bn.(n为正整数).
(1)填空:A1A2=_______,A2A3=_______.(用含m的代数式表示)
(2)若这组抛物线y1,y2,y3,…,yn的开口都向上,且△A1A2B1,△A2A3B2,…△AnAn+1Bn均是直角三角形.
①请求出二次函数y1,y2的解析式(用m表示).
②请直接写出直线
于抛物线y1,y2,y3,…,y2021共有2020个交点时,m的取值范围.
(3)若抛物线的顶点B1,B2,B3,…,Bn依次是直线
上的点,是否存在△AnAn+1Bn是等边三角形?若存在,请求出此时n的值和m的值;若不存在,说明理由.
若将点A1关于点(1,0)对称得到点A2(x2,0),将点A2关于点(2,0)对称得到点A3(x3,0);…将点An关于点(n,0)对称得到点An+1(x n+1,0).把经过点A1,A2的抛物线记作y1,其顶点记为B1;把经过A2,A3的抛物线记作y2,其顶点记为B2;…;把经过点An,An+1的抛物线记作yn,其顶点记为Bn.(n为正整数).
(1)填空:A1A2=_______,A2A3=_______.(用含m的代数式表示)
(2)若这组抛物线y1,y2,y3,…,yn的开口都向上,且△A1A2B1,△A2A3B2,…△AnAn+1Bn均是直角三角形.
①请求出二次函数y1,y2的解析式(用m表示).
②请直接写出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb70fdf064b9193e506ca43f4672af56.png)
(3)若抛物线的顶点B1,B2,B3,…,Bn依次是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb60dd65c10abde3ba0e4a60132d34d9.png)
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(0.4)
解题方法
【推荐3】如图,在平面直角坐标系中,O为坐标原点,抛物线y=ax2+bx+c(a≠0)过O、B、C三点,B、C坐标分别为(10,0)和(
,﹣
),以OB为直径的⊙A经过C点,直线l垂直x轴于B点.
![](https://img.xkw.com/dksih/QBM/2022/1/7/2889233870667776/2890100810072064/STEM/9f45e34e-f993-4a47-8b20-ea819f301df6.png?resizew=205)
(1)求直线BC的解析式;
(2)求抛物线解析式及顶点坐标;
(3)点M是⊙A上一动点(不同于O,B),过点M作⊙A的切线,交y轴于点E,交直线l于点F,设线段ME长为m,MF长为n,请猜想m•n的值,并证明你的结论;
(4)若点P从O出发,以每秒一个单位的速度向点B做直线运动,点Q同时从B出发,以相同速度向点C做直线运动,经过t(0<t≤8)秒时恰好使△BPQ为等腰三角形,请求出满足条件的t值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a85a2c984df17f7ef91d014d931410d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a316c27ccf35e5e9b4294364985927dc.png)
![](https://img.xkw.com/dksih/QBM/2022/1/7/2889233870667776/2890100810072064/STEM/9f45e34e-f993-4a47-8b20-ea819f301df6.png?resizew=205)
(1)求直线BC的解析式;
(2)求抛物线解析式及顶点坐标;
(3)点M是⊙A上一动点(不同于O,B),过点M作⊙A的切线,交y轴于点E,交直线l于点F,设线段ME长为m,MF长为n,请猜想m•n的值,并证明你的结论;
(4)若点P从O出发,以每秒一个单位的速度向点B做直线运动,点Q同时从B出发,以相同速度向点C做直线运动,经过t(0<t≤8)秒时恰好使△BPQ为等腰三角形,请求出满足条件的t值.
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