名校
解题方法
1 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09c6e2075d7f39cf14a430665a99db6.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcb0803e134a985e6b444138f75968d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97392ff60fac8a261c6eab71bba028b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)探究应用:
如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efffb3e6a571832b723b3c5795b8e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c66b632c49dbebc4b2182592d68ee937.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)问题拓展:
如图③,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac37366d2b54dc7d9a95ac6ddda5f3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c19d1cd4d7baa5906ce4478c8ca665d.png)
您最近一年使用:0次
2024-03-07更新
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268次组卷
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25卷引用:山东省日照市五莲县2020-2021学年八年级上学期期末数学试题
山东省日照市五莲县2020-2021学年八年级上学期期末数学试题贵州省六盘水市2021-2022学年七年级下学期期末数学试题山东省济南市历城区2021-2022学年七年级下学期期末数学试题山东省德州市齐河县2021-2022学年八年级上学期期末数学试题 山东省济南东南片区2021-2022学年七年级下学期期末考试数学试题 四川省乐山市沐川县2022-2023学年八年级上学期期末考试数学试题福建省三明市列东中学2020-2021学年八年级下学期期中数学试题2022年山东省烟台市中考模拟数学试题(二)(已下线)第12讲 全等三角形的相关辅助线-【暑假自学课】2022年新八年级数学暑假精品课(人教版)(已下线)专题12.34 作辅助线证明三角形全等-倍长中线(培优篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(人教版)江苏省镇江市镇江新区2022-2023学年八年级上学期10月阶段性练习数学试题(已下线)重难点01 全等三角形(6种模型) -2022-2023学年八年级数学考试满分全攻略(人教版)(已下线)专题12.1 全等三角形九大基本模型 专项讲练-2022-2023学年八年级数学上册重难题型全归纳及技巧提升专项精练(人教版)重庆市綦江区綦江区古南中学2022-2023学年八年级上学期11月月考数学试题(已下线)专题11 倍长中线证全等-【微专题】2022-2023学年八年级数学上册常考点微专题提分精练(人教版)(已下线)专题1.2 全等三角形相关辅助线五种方法 专项讲练-2022-2023学年八年级数学上册重难题型全归纳及技巧提升专项精练(苏科版)(已下线)重难点02全等三角形中“倍长中线”模型-【暑假自学课】2023年新八年级数学暑假精品课(苏科版)(已下线)专题02 全等三角形中的辅助线与模型(五大题型)-【好题汇编】备战2023-2024学年八年级数学上学期期中真题分类汇编(苏科版)(已下线)12.3(培优课)倍长中线(题型精讲精练)-【题型分类精粹】2023-2024学年八年级数学上学期期中期末复习讲练系列【考点闯关】(人教版)湖北省孝感市云梦县2023-2024学年八年级上学期期中数学试题湖南省邵阳市北塔区芙蓉学校2023-2024学年八年级上学期期中数学试题(已下线)八年级数学期末真题【考题猜想,压轴60题21个考点专练】-2023-2024学年八年级数学上学期期末考点大串讲(苏科版)湖南省邵阳市新邵县2023-2024学年八年级上学期期中数学试题(已下线)专题04 平行四边形与菱形(考点清单+20种题型解读)-2023-2024学年八年级数学下学期期中考点大串讲(苏科版)(已下线)专题03 中心对称与三角形的中位线(四种考法)-【好题汇编】备战2023-2024学年八年级数学下学期期中真题分类汇编(湖南专用)
2 . 如图1,在Rt△ABC中,D为AB的中点,P是BC边上一动点,连接PD,PA.若BC=4,AC=3,设PC=x(当点P与点C重合时,x的值为0),
.小明根据学习函数的经验,对函数y随自变量x的变化而变化的规律进行了探究.下面是小明的探究过程,请补充完整.
![](https://img.xkw.com/dksih/QBM/2022/1/10/2898035074424832/2926932901445632/STEM/c5ff96cf-6d86-40db-94e6-5173bd2c3a18.png?resizew=328)
(1)通过取点、画图、计算,得到了x与y的几组值,如下表:
说明:补全表格时,相关数值保留一位小数.
(参考数据:
,
,
).
(2)如图2,描出剩余的点,并用光滑的曲线画出该函数的图象.
(3)观察图象,下列结论正确的有______.
①函数有最小值,没有最大值 ②函数有最小值,也有最大值
③当
时,y随着x的增大而增大 ④当y>5.5时,x的取值范围是x>2.5
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137364f96c06a7af2ea43ef85837c8b6.png)
![](https://img.xkw.com/dksih/QBM/2022/1/10/2898035074424832/2926932901445632/STEM/c5ff96cf-6d86-40db-94e6-5173bd2c3a18.png?resizew=328)
(1)通过取点、画图、计算,得到了x与y的几组值,如下表:
x | 0 | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 |
y | 5.5 | 5.15 | 4.94 | 5.1 | 5.5 | 6.7 | 7.5 |
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52881be613aa404e553da30d8987cfad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc9ecdd10ca5715c988a968972e0c5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f0684b92d6d24d90a6fb39d3d6529d.png)
(2)如图2,描出剩余的点,并用光滑的曲线画出该函数的图象.
(3)观察图象,下列结论正确的有______.
①函数有最小值,没有最大值 ②函数有最小值,也有最大值
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed88f0f07094ac13096cc0fa28ca0276.png)
您最近一年使用:0次
2022-03-01更新
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257次组卷
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3卷引用:江西省赣州市寻乌县2021-2022学年九年级上学期期末数学试题
江西省赣州市寻乌县2021-2022学年九年级上学期期末数学试题江西省赣州市寻乌县2022--2023学年九年级上学期期末检测数学试卷(已下线)(重庆新中考题型模式10+8+8)黄金卷04-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷(重庆专用)
22-23八年级下·江苏·期末
3 . 解答题
(1)证明三角形中位线定理:三角形的中位线平行于第三边,且等于第三边的一半;[要求根据图1写出已知、求证、证明;在证明过程中,至少有两处写出推理依据(“已知”除外)]
(2)如图2,在
中,对角线交点为
分别是
的中点,
分别是
的中点,…,以此类推.若
的周长为1,直接用算式表示各四边形的周长之和l;
(3)借助图形3反映的规律,猜猜l可能是多少?
(1)证明三角形中位线定理:三角形的中位线平行于第三边,且等于第三边的一半;[要求根据图1写出已知、求证、证明;在证明过程中,至少有两处写出推理依据(“已知”除外)]
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38455ff05ce9f257fcb5464efdfc76e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c3c0e976147794b7c741c499753cdfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54775c0705e488886053d4df7628a06d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf177b666d3a0429c766e4b817ebe0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
(3)借助图形3反映的规律,猜猜l可能是多少?
您最近一年使用:0次
2023-06-26更新
|
188次组卷
|
9卷引用:专题12 平行四边形考前必刷真题精选【压轴题】-2022-2023学年八年级数学下学期期中期末考点大串讲(苏科版)
(已下线)专题12 平行四边形考前必刷真题精选【压轴题】-2022-2023学年八年级数学下学期期中期末考点大串讲(苏科版)河南省平顶山市宝丰县2022-2023学年八年级下学期期末数学试题(已下线)考题猜想02 中心对称图形-平行四边形(进阶必刷36题9种题型)-2023-2024学年八年级数学下学期期中考点大串讲(苏科版)(已下线)考题猜想06 八年级期中必刷题(压轴必刷48题13种题型)-2023-2024学年八年级数学下学期期中考点大串讲(苏科版)(已下线)考题猜想3-5平行四边形(常考四种题型,特殊平行四边形性质和判定的综合应用)-2023-2024学年八年级数学下学期期末考点大串讲(人教版)(已下线)第3和第6章 图形平移旋转和平行四边形(考点压轴,压轴必刷7种题型29题)-2023-2024学年八年级数学下学期期末考点大串讲(北师大版)(已下线)期末真题必刷05(压轴大题60题12个考点专练)-2023-2024学年八年级数学下学期期末考点大串讲(人教版)(已下线)第9章 中心对称图形-平行四边形 全章高频考点专练(4种专练+10个题型+3种思想)原卷版(已下线)期末复习(压轴题50题22个考点)-2023-2024学年八年级数学下学期期末考点大串讲(北师大版)
4 . 在平行四边形ABCD中,对角线AC和BD交于点O,AC=8.
![](https://img.xkw.com/dksih/QBM/2015/10/8/1573918818656256/1573918824529920/STEM/0fc31c250b5f45679da4ea3cc681e383.png)
(1)如图1,若AB⊥AC,BD=12,点P是线段AD上的动点(不包含端点A,D),过点P作PE⊥AC,垂足为点E,PF⊥BD,垂足为点F,设PE=x,PF=y,求y与x的函数关系式并直接写出自变量x的取值范围;
(2)如图2,若AE平分∠BAC,点F为BC中点,且点F保持在点E的右边,求线段BC的变化范围.
![](https://img.xkw.com/dksih/QBM/2015/10/8/1573918818656256/1573918824529920/STEM/0fc31c250b5f45679da4ea3cc681e383.png)
(1)如图1,若AB⊥AC,BD=12,点P是线段AD上的动点(不包含端点A,D),过点P作PE⊥AC,垂足为点E,PF⊥BD,垂足为点F,设PE=x,PF=y,求y与x的函数关系式并直接写出自变量x的取值范围;
(2)如图2,若AE平分∠BAC,点F为BC中点,且点F保持在点E的右边,求线段BC的变化范围.
您最近一年使用:0次
5 . 【感知】小明同学在学习相似三角形时遇到这样一个问题:
小明发现,过点
作
交
于
,可证明
,得到相关结论后,再利用相似三角形的性质即可得到问题的答案.下面是小明的部分证明过程:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/79e71c6d-1ae0-4a65-8b4d-89afb4be0e9b.png?resizew=536)
解:如图①,过点
作
交
于
,则
,
,
∵
是
的中点,
∴
,
∴
,
∴
,
∴
,
∵
是
的一个三等分点,且
,
∴
,
∴
,
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49f1b0358987a2bf628d25df3c280150.png)
请你补全余下的证明过程.
【尝试应用】
如图②,在
中,
为
上一点,
,连结
,若
,交
、
于点
、
.若
,
,
,则
的长为______.
【拓展提高】
如图③,在平行四边形
中,点
为
的中点,点
为
上一点,
与
、
分别交于点
、
,若
,则
的值为______.
如图,在![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb9e49c1a0bb7db8b808b805d08c499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0f36c4d133da7a2b7f6665a46fd325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49f1b0358987a2bf628d25df3c280150.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/79e71c6d-1ae0-4a65-8b4d-89afb4be0e9b.png?resizew=536)
解:如图①,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb9e49c1a0bb7db8b808b805d08c499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee0f36c4d133da7a2b7f6665a46fd325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01f773ee1d4280f9ef5278c6738c92ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f317a9a9b7d95f827593f72b223d26.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/532aece6cfd67e2a97977eed978dbf2b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70e9557de903cfe3d095cb821abcff6.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78eb5b388afc0437ec7805c5608ebe7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ac6111180757359050b6af741d12dc.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa61d9f35c4160f319e77be88c7f033.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc63ac949336bc7f62634f359a8593c9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0c0e406072a645180d49c3295c73c0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49f1b0358987a2bf628d25df3c280150.png)
请你补全余下的证明过程.
【尝试应用】
如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21d8e7af78693e5da7957c8034e8bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
【拓展提高】
如图③,在平行四边形
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14cbce0fef923b14f40d18c0c15ef23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96690c112163231c015adebd5f138380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/064f3aa6e912fd41811bee2bf9ea1aba.png)
您最近一年使用:0次
6 . 如图,已知
为
的直径,
为
上一点.
![](https://img.xkw.com/dksih/QBM/2023/2/14/3174677670928384/3176654317797376/STEM/54541466be0a4c97ac0ff864c6eecdd2.png?resizew=136)
(1)用尺规作图:过点
作
的垂线,垂足为
,交劣弧
于点
;(只保留作图痕迹);
(2)根据(1)中作图,若
,
,求
的长,请回答下列解答过程中的序号①、②、③、④所对应的内容.
解:∵AC为
的直径,
为
上一点,
∴
① ;
在
中,
,
,
∴
,
∴
,
∵OE为半径,
,
∴
② ;
又∵
,
∴OD是
的中位线,
∴ ③
;
∴
④ .
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2023/2/14/3174677670928384/3176654317797376/STEM/54541466be0a4c97ac0ff864c6eecdd2.png?resizew=136)
(1)用尺规作图:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)根据(1)中作图,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
解:∵AC为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db07c6ce6c8b0e96a3470c6a3491334.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d2eae98e1683fbb9533584450dd696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853c4d316bf8490b993277bbd36ee783.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37fe01de48a73005b87dc9475ce2908.png)
∵OE为半径,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178e3fa2e4de57a4c067e79be7d798e7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b696ee663a89d24dfc6a11666e46ff98.png)
∴OD是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
∴ ③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502a0c0262d7ae22b7096f2247e9bb83.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f411af9199ac8da4be480e1ed661ed2d.png)
您最近一年使用:0次
名校
解题方法
7 . 将等边三角形
如图放置在平面直角坐标系中,
,
为线段
的中点,将线段
绕点
逆时针旋转
得线段
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/28/82eb7728-58b5-4ea0-b2a1-b2d47d914712.png?resizew=536)
(1)如图1,求点E的坐标;
(2)在图1中,
与
交于点
,连接
,
为
的中点,连接
,求线段
的长.请你补全图形,并完成计算;
(3)如图2,将
绕点
逆时针旋转,
为线段
的中点,
为线段
的中点,连接
,请直接写出在旋转过程中
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/28/82eb7728-58b5-4ea0-b2a1-b2d47d914712.png?resizew=536)
(1)如图1,求点E的坐标;
(2)在图1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4a63d14654c66cc71bf26293d698ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4a63d14654c66cc71bf26293d698ec.png)
(3)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
2024-04-05更新
|
154次组卷
|
5卷引用:天津市第十一中学2023-2024学年九年级上学期期末数学试题
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