真题
名校
1 . 探究与实践
“善思”小组开展“探究四点共圆的条件”活动,得出结论:对角互补的四边形四个顶点共圆.该小组继续利用上述结论进行探究.
提出问题:
如图1,在线段
同侧有两点
,
,连接
,
,
,
,如果
,那么
,
,
,
四点在同一个圆上.
如图2,作经过点
,
,
的
,在劣弧
上取一点
(不与
,
重合),连接
,
则
(依据1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8826527c10e6d04009ca7f3313163d34.png)
点
,
,
,
四点在同一个圆上(对角互补的四边形四个顶点共圆)
点
,
在点
,
,
所确定的
上(依据2)
点
,
,
,
四点在同一个圆上
(1)反思归纳:上述探究过程中的“依据1”、“依据2”分别是指什么?
依据1:__________;依据2:__________.
(2)图3,在四边形
中,
,
,则
的度数为__________.
是等腰三角形,
,点
在
上(不与
的中点重合),连接
.作点
关于
的对称点
,连接
并延长交
的延长线于
,连接
,
.
,
,
,
四点共圆;
②若
,
的值是否会发生变化,若不变化,求出其值;若变化,请说明理由.
“善思”小组开展“探究四点共圆的条件”活动,得出结论:对角互补的四边形四个顶点共圆.该小组继续利用上述结论进行探究.
提出问题:
如图1,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
如图2,作经过点
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c193e68966879232ca0c83281bfd32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba51168da9382b9e573fcc4a88b6268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8826527c10e6d04009ca7f3313163d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(1)反思归纳:上述探究过程中的“依据1”、“依据2”分别是指什么?
依据1:__________;依据2:__________.
(2)图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8889aad264f6d356c3f8bebe7d92e1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4c3c0a34dc21292fa32befd58d8f82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e52911a1ce4e7aab20151eb49322cd.png)
您最近一年使用:0次
2022-06-30更新
|
1435次组卷
|
11卷引用:2022年贵州省遵义市中考数学真题
2022年贵州省遵义市中考数学真题(已下线)专题20 与圆相关的压轴题-2022年中考数学真题分项汇编(全国通用)(第2期)(已下线)重难点04与圆相关的位置关系(11种模型)-2022-2023学年九年级数学考试满分全攻略(人教版)(已下线)第一节 圆的性质及其证明与计算03综合测江苏省扬州市仪征市第三中学2022-2023学年九年级下学期第一次月考数学试题2023年江苏省淮安市淮安区中考一模数学试题2023年山西省朔州市怀仁市中考一模数学试题(已下线)重难点02“四点共圆”模型-【暑假自学课】2023年新九年级数学暑假精品课(苏科版)(已下线)2023年贵州省中考数学真题变式题22-25题(已下线)24.4(培优课)辅助圆、隐圆(题型精讲精练)-【题型分类精粹】2023-2024学年九年级数学上学期期中期末复习讲练系列【考点闯关】(人教版)2024年广东省珠海市凤凰中学中考三模数学试题
2 . 已知抛物线
与x轴交于点
,
,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661428174848/STEM/66800771-ff0e-44c0-bc9b-1da856c411d1.png?resizew=372)
(1)求抛物线的函数解析式.
(2)如图1,点D在抛物线上,过点D作
轴,交直线BC于点E,交x轴于点F,设点D的横坐标为m,且
,求线段DE长度的最大值.
(3)如图2,设M为抛物线的顶点,
,在y轴上是否存在点Q,使得
?若存在,求出点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661428174848/STEM/66800771-ff0e-44c0-bc9b-1da856c411d1.png?resizew=372)
(1)求抛物线的函数解析式.
(2)如图1,点D在抛物线上,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/010989c488d7f0551c9f2aa8bba6bf1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1464ddc459a7d19e2ff4e322c171e123.png)
(3)如图2,设M为抛物线的顶点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ecab76dc432d7571230ae427262c222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caeeab8917ab89f1379d9b846653b463.png)
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3 . 如图,在△ABC中BC<AC,∠A+∠C=60°,点D在BC上,点E在AC上,连接DE,∠ABC=∠DEC,过点B作BF⊥AC于点F.若DB=AB,则
的值为( )
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661427109888/STEM/42c268a6-db7e-40c1-95d6-248658f7503d.png?resizew=281)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ae9da6f83c6fd6b062893b2a86755aa.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987806576640000/2992661427109888/STEM/42c268a6-db7e-40c1-95d6-248658f7503d.png?resizew=281)
A.1 | B.2 | C.![]() | D.![]() |
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4 . 如图,在Rt△ABC中,∠ABC=90°,以BC边的中点O为圆心,
BC为半径作圆,点D是⊙O上一动点,点E是弦CD的中点,连接AE,若BC=4,AB=3,则AE+
BE的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985697865170944/2991237720801280/STEM/de15e49b-861b-48a2-8f58-273517f19eba.png?resizew=242)
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5 . 某校数学兴趣学习小组在一次活动中,对一些特殊几何图形具有的性质进行了如下探究:
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987836066627584/2989662813904896/STEM/615591b2-412d-4071-a9b3-a4f34f18eb95.png?resizew=931)
(1)发现问题:如图1,在等腰
中,
,点
是边
上任意一点,连接
,以
为腰作等腰
,使
,∠MAN=∠BAC,连接
.求证:
.
(2)类比探究:如图2,在等腰
中,
,
,
,点
是边
上任意一点,以
为腰作等腰
,使
,
.在点
运动过程中,
是否存在最小值?若存在,求出最小值,若不存在,请说明理由.
(3)拓展应用:如图3,在正方形
中,点
是边
上一点,以
为边作正方形
,
是正方形
的中心,连接
.若正方形
的边长为6,
,求
的面积.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987836066627584/2989662813904896/STEM/615591b2-412d-4071-a9b3-a4f34f18eb95.png?resizew=931)
(1)发现问题:如图1,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765917637583d22a579ff075f9baa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0eef65b7d4459a21b2e8a04b26f58e6.png)
(2)类比探究:如图2,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965f4956928390099975a610bd0d8514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3120ed27a38e603da96b23aab70dfb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
(3)拓展应用:如图3,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5693553cd6992eda2b827fd73fb73766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c768dedaea22607617398ce28a02dd8.png)
您最近一年使用:0次
2022-05-29更新
|
287次组卷
|
2卷引用:2022年贵州省遵义市新蒲新区初中生毕业认定测试(三模)数学试卷
6 . 如图,已知矩形ABCD,AB=8,BC=4,点M,N分别是线段AC,AB上的两个动点,则BM+MN最小值为______ .
![](https://img.xkw.com/dksih/QBM/2022/5/6/2973769511567360/2974440002674688/STEM/685c824f-e366-4688-9219-b93d95b94a10.png?resizew=283)
您最近一年使用:0次
7 . 问题背景:已知∠GDH的顶点在边BC所在直线上(不与B,C重合),DG交AB所在直线于点E、DH交AC所在直线于点F.记△BDE的面积为
,△CDF的面积为
.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966646875054080/2971554383740928/STEM/57720214-b799-48cf-a072-a53a80f908e0.png?resizew=683)
(1)初步尝试:如图1,当△ABC是等边三角形.
,
,且
,
时,
.
(2)类比探究:在(1)的条件下,沿BC方向平移∠GDH,使得
,如图2所示位置,则
.
(3)延伸拓展:当△ABC是等腰三角形时,
.
(Ⅰ)如图3当点D在线段BC上运动时,设
,
,
①求证:△BDE∽△CFD.
证明:
∵
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80cc7db43b1e3c3255b497507a66610e.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba02910a01689f636c71116e96dfdf33.png)
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
∴△BDE∽△CFD.
②直接写出
,
(结果用含m,π,β的三角函数表示).
(Ⅱ)如图4,当点D在BC的延长线上运动时,设
,
,求
的表达式(结果用含m,n,β的三角函数表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966646875054080/2971554383740928/STEM/57720214-b799-48cf-a072-a53a80f908e0.png?resizew=683)
(1)初步尝试:如图1,当△ABC是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08420da525b8cf84f7cf202d94cd7b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afedac49ce38f25e0a73e579133afe5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e59f3c0ac1fcc0dfc2076274776a57.png)
(2)类比探究:在(1)的条件下,沿BC方向平移∠GDH,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e59f3c0ac1fcc0dfc2076274776a57.png)
(3)延伸拓展:当△ABC是等腰三角形时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d298836e57b7eab140cdb1574fd4ec.png)
(Ⅰ)如图3当点D在线段BC上运动时,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c4a6228026eb423be917b19e202794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad3fd1b54bf975d0e97990247aab714.png)
①求证:△BDE∽△CFD.
证明:
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e1d4a059b3ad089f006db5998bce3fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5324ce5fd43c5b05e8fad764880f7b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80cc7db43b1e3c3255b497507a66610e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba02910a01689f636c71116e96dfdf33.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
∴△BDE∽△CFD.
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9207a69d655849e6958adb701e1fda62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e59f3c0ac1fcc0dfc2076274776a57.png)
(Ⅱ)如图4,当点D在BC的延长线上运动时,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c4a6228026eb423be917b19e202794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad3fd1b54bf975d0e97990247aab714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884d40a97fd767e95f34f3b91ab8d84c.png)
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8 . 如图,在平面直角坐标系xOy中,O为坐标原点,点
,点
,AC是△ABO的中线,且⊙M经过O,A,C三点,抛物线的顶点为M.并且经过点B,⊙M的切线CD交x轴于D,⊙M与抛物线的其中一个交点为G,连接AG,CG.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/4df781bb-6ff4-434f-9238-1da731eae308.png?resizew=269)
(1)求抛物线的解析式;
(2)设直线CD与抛物线的交点的横坐标为h,求h的值;
(3)设点G的坐标为
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d429efe96d68065e7d433c996682791d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/4df781bb-6ff4-434f-9238-1da731eae308.png?resizew=269)
(1)求抛物线的解析式;
(2)设直线CD与抛物线的交点的横坐标为h,求h的值;
(3)设点G的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba7204f43679af6935e494c59d40c6ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
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9 . 如图,在
中,
,
,
,点O为边AC上的一点,以点O为圆心,半径为6作半圆O,与AC交于点D.
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965953398898688/2968144076537856/STEM/e4a090ed-0dae-4a84-8b28-39ae49767c68.png?resizew=310)
(1)如图1,BC与半圆O相切时,求证AB与半圆O相切;
(2)如图2,点O为AC中点时,将线段CD连同半圆O绕点C旋转.若半圆O与
的直角边相切,设切点为K,连接AK,求AK的长。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://img.xkw.com/dksih/QBM/2022/4/25/2965953398898688/2968144076537856/STEM/e4a090ed-0dae-4a84-8b28-39ae49767c68.png?resizew=310)
(1)如图1,BC与半圆O相切时,求证AB与半圆O相切;
(2)如图2,点O为AC中点时,将线段CD连同半圆O绕点C旋转.若半圆O与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
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10 . 已知
ABC与
DEC为直角三角形,
.
![](https://img.xkw.com/dksih/QBM/2022/4/1/2953685640708096/2963049214844928/STEM/a7e1faaa-4c42-4bee-98af-39386cc1c088.png?resizew=637)
(1)【问题发现】如图1,若
时,点D是线段AB上一动点,连接BE.则
______,
______°;
(2)【类比探究】如图2,若
,点D是线段AB上一动点,连接BE.请判断
的值及
的度数,并说明理由;
(3)【拓展延伸】如图3,在(2)的条件下,将点D改为直线AB上一动点,其余条件不变,取线段DE的中点M,连接BM、CM,若
,则当
CBM是直角三角形时,请求线段BE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://img.xkw.com/dksih/QBM/2022/4/1/2953685640708096/2963049214844928/STEM/a7e1faaa-4c42-4bee-98af-39386cc1c088.png?resizew=637)
(1)【问题发现】如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a356ae65ad2cccdd27189efcea2da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75952e47a72c19dc1ad38a90801d6c07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da0d8293dc1e7b9ebe2006a23470899d.png)
(2)【类比探究】如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17df03e1b7418a84e8f8a3d512b2c1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274ae3f70122c99addb6df12405bac91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
(3)【拓展延伸】如图3,在(2)的条件下,将点D改为直线AB上一动点,其余条件不变,取线段DE的中点M,连接BM、CM,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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