如图,已知抛物线
与x轴交于A,B两点,对称轴为直线
,直线AD交抛物线于点D(2,3).
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748207067136/1573748213293056/STEM/b4a700f8bd3a4a22909f90eea9425950.png)
(1)求抛物线的解析式;
(2)已知点M为第三象限内抛物线上的一动点,当点M在什么位置时四边形AMCO的面积最大?并求出最大值;
(3)当四边形AMCO面积最大时,过点M作直线平行于y轴,在这条直线上是否存在一个以Q点为圆心,OQ为半径且与直线BC相切的圆?若存在,求出圆心Q的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748207067136/1573748213293056/STEM/5b7ec1b7923041fc866e6b244f351595.png)
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748207067136/1573748213293056/STEM/2dd8cf62aafe47bd9006ad860463f6f3.png)
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748207067136/1573748213293056/STEM/b4a700f8bd3a4a22909f90eea9425950.png)
(1)求抛物线的解析式;
(2)已知点M为第三象限内抛物线上的一动点,当点M在什么位置时四边形AMCO的面积最大?并求出最大值;
(3)当四边形AMCO面积最大时,过点M作直线平行于y轴,在这条直线上是否存在一个以Q点为圆心,OQ为半径且与直线BC相切的圆?若存在,求出圆心Q的坐标;若不存在,请说明理由.
更新时间:2016-12-05 21:01:50
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解答题-问答题
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解题方法
【推荐1】如图,已知二次函数的图象过点
.
,与
轴交于另一点
,且对称轴是直线
.
(1)求该二次函数的解析式;
(2)若
是
上的一点,作
交
于
,当
面积最大时,求
的长;
(3)
是
轴上的点,过
作
轴与抛物线交于
,过
作
轴于
,当以
为顶点的三角形与以
为顶点的三角形相似时,求
点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b62194097ac66a5093c57fca2f5b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/331ed827ebff6587e06eb407486894d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
(1)求该二次函数的解析式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d24e554db06a587a517a1901be12601a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14513222a49fe71a9e36e82fa9167723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2784a52c4da98dc9df661fc152fc29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2241bd71e0c20867029e489f9ba655d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2665479c5fb12e1e728716a30a219c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e52646f314d46b8127d5d1b10459e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2020/5/6/2456729327017984/2457348592123904/STEM/5153c08ee7dc456eb70500ebf7cb3a3d.png?resizew=288)
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【推荐2】如图,已知抛物线经过
,
,
三点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/9a311585-f7a2-4077-a880-9873641dce46.png?resizew=172)
(1)求抛物线的解析式;
(2)连接BC,点D是线段BC上方抛物线上一点,过点D作
,交x轴于点E,连接AD交BC于点F,当
取得最小值时,求点D的横坐标;
(3)点G为抛物线的顶点,抛物线对称轴与x轴交于点H,连接GB,点M是抛物线上的动点,设点M的横坐标为m.
①当
时,求点M的坐标;
②过点M作
轴,与抛物线交于点N,P为x轴上一点,连接PM,PN,将△PMN沿着MN翻折,得△QMN,若四边形MPNQ恰好为正方形,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/9a311585-f7a2-4077-a880-9873641dce46.png?resizew=172)
(1)求抛物线的解析式;
(2)连接BC,点D是线段BC上方抛物线上一点,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c31277a174496fc1aa13c80e11ef2ff4.png)
(3)点G为抛物线的顶点,抛物线对称轴与x轴交于点H,连接GB,点M是抛物线上的动点,设点M的横坐标为m.
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8adbcd1a53591866deffb33b8683fc24.png)
②过点M作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8551c3761e951c7005c4290d243cfe5e.png)
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【推荐1】我们知道:角平分线上的点到角的两边距离相等,如图①,E是
的平分线
上任意一点,若
,垂足分别为C,D,则
.
换一种眼光看:如图①,
是
的平分线,C、D、E分别是
上的动点,若
,则
.
(1)一般化:如图②,射线
是
的平分线,C,D,E分别是
上的动点,若
,则
与
的数量关系是______.
(2)再倒过来想一想:如图③,
是
的平分线,C、D、E分别是
上的动点,若
,则
与
有什么关系?请将图形补充完整并结合图形证明你的结论;
(3)用用看:已知点
在y轴上,点
在函数
的图像上,点C在函数
的图像上,连接
、
,若
,直接写出点C的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b199d84cafeaf551de811bd999978d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0101a7b5c8a4aed0de2af363792e39a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95591baeb2ce9efab4170a6bb6ad8ea5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0175dc2b94c0825fc250da0a2ba648.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/686391cd-3605-48c6-9d86-451e1957196e.png?resizew=412)
换一种眼光看:如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0101a7b5c8a4aed0de2af363792e39a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b199d84cafeaf551de811bd999978d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b09a1a74a76a32f46542bce7b3bbc44a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ef3cc00bad2abebaaa20ec9d9f2466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686171942bd7698035016c732db43b63.png)
(1)一般化:如图②,射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0101a7b5c8a4aed0de2af363792e39a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b199d84cafeaf551de811bd999978d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a74a2f3ab3ce7500db2519ea81f73b41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91a132df75e02906cf6f3af3b297497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
(2)再倒过来想一想:如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0101a7b5c8a4aed0de2af363792e39a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b199d84cafeaf551de811bd999978d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b09a1a74a76a32f46542bce7b3bbc44a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a1c9a12e9d28b82553b04f5269df3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec732664c82259ab1e93c1509777bd32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c627d27f416c188681fcab7629b8e238.png)
(3)用用看:已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7959c2b38e5fcad0002a080a413d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b80da010e77e948075685c79c295c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1d8d5cea065075fe50706abe3ae802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
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解答题-作图题
|
较难
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【推荐2】定义:能完全覆盖平面图形的最小的圆称为该平面图形的最小覆盖圆.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/cd8a8c51-4bec-46d0-b7ff-ae44aebb0c0f.png?resizew=427)
(1)如图①,线段
,则线段AB的最小覆盖圆的半径为 ;
(2)如图②,
中,
,
,
,请用尺规作图 ,作出
的最小覆盖圆(保留作图痕迹,不写作法).
(3)如图③,矩形
中,
,
,若用两个等圆完全覆盖该矩形
,那么这两个等圆的最小半径为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/cd8a8c51-4bec-46d0-b7ff-ae44aebb0c0f.png?resizew=427)
(1)如图①,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba56b41fe702d9b6433e4d01e48d69a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4346641491fc90d125ebbd06343382a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
(3)如图③,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
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解答题-证明题
|
较难
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【推荐1】课本呈现:如图1,在射门游戏中,球员射中球门的难易程度与他所处的位置
对球门
的张角(
)有关.当球员在
,
处射门时,则有张角
.某数学小组由此得到启发,探究当球员在球门
同侧的直线
射门时的最大张角.
问题探究:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/b37410c0-40fd-4b72-8fd7-763a44aeeab8.png?resizew=148)
(1)如图2,小明探究发现,若过
、
两点的动圆与直线
相交于点
、
,当球员在
处射门时,则有
.
小明证明过程如下:
设直线
交圆于点
,连接
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf166f55c52da949191dbbc34695639e.png)
∵
___________![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d50a4c28b1d9ad802d026a1aaa5792.png)
∴
___________![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d50a4c28b1d9ad802d026a1aaa5792.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed268ad60e1eec14ea61db7bd27468eb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/8d64b639-48bb-4662-9514-8a8ae2808eee.png?resizew=249)
(2)如图3,小红继续探究发现,若过
、
两点的动圆与直线
相切于点
,当球员在
处射门时,则有
,你同意吗?请你说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/e9e589c9-daa9-48fd-8546-700389eccadb.png?resizew=231)
问题应用:如图4,若
,
米,
是中点,球员在射线
上的
点射门时的最大张角为
,则
的长度为___________米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/34941b93-c1ae-4547-bf6a-d3f127625cbe.png?resizew=219)
问题迁移:如图5,在射门游戏中球门
,
是球场边线,
,
是直角,
.若球员沿
带球前进,记足球所在的位置为点
,求
的最大度数.(参考数据:
,
,
,
,
.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1beff025b32f688316009552d2fd8e1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
问题探究:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/b37410c0-40fd-4b72-8fd7-763a44aeeab8.png?resizew=148)
(1)如图2,小明探究发现,若过
![](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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed268ad60e1eec14ea61db7bd27468eb.png)
小明证明过程如下:
设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf166f55c52da949191dbbc34695639e.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d63783f365e666ace307cadcaba60fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d50a4c28b1d9ad802d026a1aaa5792.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41db498f025052df2dbb1e50ab672675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d50a4c28b1d9ad802d026a1aaa5792.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed268ad60e1eec14ea61db7bd27468eb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/8d64b639-48bb-4662-9514-8a8ae2808eee.png?resizew=249)
(2)如图3,小红继续探究发现,若过
![](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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d914c8b4e582381296e354478e3f29.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/e9e589c9-daa9-48fd-8546-700389eccadb.png?resizew=231)
问题应用:如图4,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfb836792b1eebfbd08a6f46fae580e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038371da1fbaa349f14d17b921ffa00c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/34941b93-c1ae-4547-bf6a-d3f127625cbe.png?resizew=219)
问题迁移:如图5,在射门游戏中球门
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/587ff8b7fbfbd7c8091f667e5c880dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6cc3789c0e9b7d1226aa0de3327599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c7d57dc502fcce9cb4b6d6618015d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41124669c360901c553ef7aa956132c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f3ea31f96f8d31840654258fdb14c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a06746fef2abb36335975a94ec150a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6156069923ccccf22932fba9c4f4b8d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/3bdf9a0c-3154-45a9-b4fd-eb5a2dd6a9fc.png?resizew=186)
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【推荐2】定义:顶点在圆上,一边和圆相交,另一边和圆相切的角叫做弦切角.如图1,
为
的切线,点
为切点,
为
内一条弦,
即为弦切角.
![](https://img.xkw.com/dksih/QBM/2022/11/10/3106650871046144/3147602086764544/STEM/c810daaa2f0445b4aeb4055df91f007d.png?resizew=524)
(1)古希腊数学家欧几里得的《几何原本》是一部不朽的数学巨著,全书共13卷,以第1卷的23个定义、5个公设和5个公理作为基本出发点,给出了119个定义和465个命题及证明.第三卷中命题32一弦切角定理的内容是:“弦切角的度数等于它所夹的弧所对的圆心角度数的一半,等于它所夹的弧所对的圆周角度数.”
如下给出了弦切角定理不完整的“已知”和“求证”,请补充完整,并写出“证明”过程.
已知:如图2,
为
的切线,点
为切点,
为
内一条弦,点
在
上,连接
,
,
,
.
求证:
.
证明:
(2)如图3,
为
的切线,
为切点,点
是
上一动点,过点
作
于点
,
交
于
,连接
,
,
.若
,
,求弦
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://img.xkw.com/dksih/QBM/2022/11/10/3106650871046144/3147602086764544/STEM/c810daaa2f0445b4aeb4055df91f007d.png?resizew=524)
(1)古希腊数学家欧几里得的《几何原本》是一部不朽的数学巨著,全书共13卷,以第1卷的23个定义、5个公设和5个公理作为基本出发点,给出了119个定义和465个命题及证明.第三卷中命题32一弦切角定理的内容是:“弦切角的度数等于它所夹的弧所对的圆心角度数的一半,等于它所夹的弧所对的圆周角度数.”
如下给出了弦切角定理不完整的“已知”和“求证”,请补充完整,并写出“证明”过程.
已知:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c62c89ab8200307ee0a4a740ddb16c33.png)
证明:
(2)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b0de946a00e11d2f787fcdebc99e8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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名校
【推荐1】如图,抛物线y=ax2﹣2ax+m的图象经过点P(4,5),与x轴交于A、B两点(点A在点B的左边),与y轴交于点C,且S△PAB=10.
![](https://img.xkw.com/dksih/QBM/2019/12/1/2345576534507520/2345879299637248/STEM/81a718b134f94e7a98fb5da48d1fa013.png?resizew=604)
(1)求抛物线的解析式;
(2)在抛物线上是否存在点Q使得△PAQ和△PBQ的面积相等?若存在,求出Q点的坐标,若不存在,请说明理由;
(3)过A、P、C三点的圆与抛物线交于另一点D,求出D点坐标及四边形PACD的周长.
![](https://img.xkw.com/dksih/QBM/2019/12/1/2345576534507520/2345879299637248/STEM/81a718b134f94e7a98fb5da48d1fa013.png?resizew=604)
(1)求抛物线的解析式;
(2)在抛物线上是否存在点Q使得△PAQ和△PBQ的面积相等?若存在,求出Q点的坐标,若不存在,请说明理由;
(3)过A、P、C三点的圆与抛物线交于另一点D,求出D点坐标及四边形PACD的周长.
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【推荐2】如图,二次函数
的图象与 x 轴交于
、
两点,与 y 轴交于点 C,D 为抛物线的顶点.
(2)求
的面积;
(3)在抛物线对称轴上,是否存在一点P,使 P,B,C为顶点的三角形为等腰三角形?若存在,写出点P 的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c0c5cad5bc172406ed888808852f85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
(3)在抛物线对称轴上,是否存在一点P,使 P,B,C为顶点的三角形为等腰三角形?若存在,写出点P 的坐标;若不存在,请说明理由.
您最近一年使用:0次