1 . 通过以前的学习,我们知道:“如图1,在正方形
中,
,则
”.
某数学兴趣小组在完成了以上学习后,决定对该问题进一步探究:
中,点
分别在线段
上,且
,试猜想
_________;
(2)【知识迁移】如图3,在矩形
中,
,点
分别在线段
上,且
,试猜想
的值,并证明你的猜想;
(3)【拓展应用】如图4,在四边形
中,
,点
分别在线段
上,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50718815e5b60540035d988ca80c0d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de32b9f279d0cbf3bc8ab9ada1f56111.png)
某数学兴趣小组在完成了以上学习后,决定对该问题进一步探究:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418611b495c71cbdc2f9102bcdc72300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ed2e6490abf519cf95cc1c4cb5ed60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d94fef6d03173baf154ac97154571366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7996d44acc430748b604e121fee1cb8e.png)
(2)【知识迁移】如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f7a5ed625693741921fa9148a6b74b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418611b495c71cbdc2f9102bcdc72300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ed2e6490abf519cf95cc1c4cb5ed60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d94fef6d03173baf154ac97154571366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885a273360456694a3d40a913f3df2fc.png)
(3)【拓展应用】如图4,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be012ed58284cbf788365899d13060c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a460f95e8ebabac97d572fecea8fb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c18645bedb8cdf66c41ca9b0bf705f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb6456423140d43ee212a5cc99fa6284.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea624cb140001a7e9d7567903a29521.png)
您最近一年使用:0次
2024-03-17更新
|
137次组卷
|
9卷引用:2023年安徽省合肥市南岗中学中考一模数学试卷
23-24九年级上·浙江·期末
2 . 综合与实践
探究主题 | 直角三角板与圆 |
探究背景 | 学习了《圆周角》中的推论:“直径所对的圆周角等于![]() ![]() |
探究 任务1 | 找到画直径的简单方法:把直角顶点放在圆上,连接两直角边与圆的两个交点,连两交点的连线是直径.请你说出其中原理:____________. |
探究 任务2 | 用电脑作图工具,对直角顶点在圆外的情况进行动态模拟,发现:无论直角顶点在圆外如何运动,只要两直角边与圆有两个交点,两条直角边所夹的两段弧的度数差不变,为![]() ![]() ![]() 证:如图3,连接 ![]() ![]() 又 ![]() ![]() ![]() ![]() 探究任务:运用 ![]() ![]() |
探究 任务3 | 当直角顶点运动到圆内时如图4,直角![]() ![]() ![]() 你的猜想:_________(可以用文字描述,也可以结合图形用几何语言描述) 证明: |
探究 任务4 | 各研究小组进行拓展研究比赛,其中高斯研究小组提出问题: 如图,若弦 ![]() ![]() 你的解答是: |
您最近一年使用:0次
3 . 问题情境:在数学活动课上,王老师让同学们用两张矩形纸片进行探究活动.
阳光小组准备了两张矩形纸片
和
,其中
,
,将它们按如图1所示的方式放置,当点A与点
重合,点
,
分别落在
,
边上时,点
,
恰好为边
,
的中点.然后将矩形纸片
绕点A按逆时针方向旋转,旋转角为
,连接
与
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/416857af-9783-444d-9f70-f19eafdb8f51.png?resizew=463)
观察发现:
(1)如图2,当
时,小组成员发现
与
存在一定的关系,其数量关系是________;位置关系是 ;
探索猜想:
(2)如图3,当
时,(1)中发现的结论是否仍然成立?请说明理由;
拓展延伸:
(3)在矩形
旋转过程中,当
,
,
三点共线时,请直接写出线段
的长.
阳光小组准备了两张矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/416857af-9783-444d-9f70-f19eafdb8f51.png?resizew=463)
观察发现:
(1)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
探索猜想:
(2)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b5ea2fc43b19ca043581eb94197234.png)
拓展延伸:
(3)在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
您最近一年使用:0次
4 . 综合与实践课上,老师让同学们以“矩形与垂直”为主题开展数学活动.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/267fb3cc-81b9-41a7-a182-95a61f985483.png?resizew=121)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/68d6ae2f-f5f9-4892-a99f-2379deae8257.png?resizew=168)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/b2a0da12-3bf9-4312-8288-6ba1a0b14d99.png?resizew=121)
(1)操作判断
如图1,正方形纸片
,在边
上任意取一点
,连接
,过点
作
于点
,与边
交于点
.根据以上操作,请直接写出图1中线段
与线段
的关系.
(2)迁移探究
小华将正方形纸片换成矩形纸片,继续探究,过程如下:
如图2,在矩形纸片
中,
,在边
上任意取一点
,连接
,过点
作
于点
,与边
交于点
,请求出线段
与
的关系,并说明理由.
(3)拓展应用
如图3,已知正方形纸片
的边长为2,动点
由点
向终点
做匀速运动,动点
由点
向终点
做匀速运动,动点
、
同时开始运动,且速度相同,连接
、
,交于点
,连接
,则线段
长度的最小值为______.(直接写出答案不必说明理由)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/267fb3cc-81b9-41a7-a182-95a61f985483.png?resizew=121)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/68d6ae2f-f5f9-4892-a99f-2379deae8257.png?resizew=168)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/b2a0da12-3bf9-4312-8288-6ba1a0b14d99.png?resizew=121)
(1)操作判断
如图1,正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)迁移探究
小华将正方形纸片换成矩形纸片,继续探究,过程如下:
如图2,在矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c691ca9b28ab952badcc89418d07e6.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/274cf35acb4a1748d15c39d15a9bea7b.png)
(3)拓展应用
如图3,已知正方形纸片
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
您最近一年使用:0次
5 . 李老师善于通过合适的主题整合教学内容,帮助同学们用整体的、联系的、发展的眼光看问题,形成科学的思维习惯.下面是李老师在“图形的变化”主题下设计的问题,请你解答.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/d91ff9b5-84cc-40b3-9f37-fb75e1ac4da6.png?resizew=517)
(1)问题背景
如图
,正方形
中,点
为
边上一点,连接
,过点
作
交
边于点
,将
沿直线
折叠后,点
落在点
处,当
时,
____________;
如图
,连接
,当点
恰好落在
上时,其他条件不变,则
____________;
(2)探究迁移
如图
,在(
)的条件下,若把正方形
改成矩形
,且
,其他条件不变,请写出
与
之间的数量关系式(用含
的式子表示),并说明理由;
(3)拓展应用
如图
,在(
)的条件下,若把正方形
改成菱形
,且
,
,其他条件不变,当
时,请直接写出
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/d91ff9b5-84cc-40b3-9f37-fb75e1ac4da6.png?resizew=517)
(1)问题背景
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f0805cc7a96c866df10b667ac4851e.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/a25c28359f8d8da9eaf4672a6cf8ae4f.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/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b13fff157b3ff2b7d80c0cfb3e7a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f331b8b4f9fc690b2e4785c8dd0527dc.png)
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af9650e51fef805788fe4fea3cfb527.png)
(2)探究迁移
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52a55bd36f9d239416d7c8fa5d78bc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71fe246270d1277f9eb2bf15af22e83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)拓展应用
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f39dacbcf8ca8364b47ac277beec70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c628297022d4dee189225c9441877539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71fe246270d1277f9eb2bf15af22e83.png)
您最近一年使用:0次
名校
6 . 问题提出
(1)如图1,在正方形
中,E、F分别是边
和对角线
上的点,
.求证:
;
问题探究
(2)如图2,在矩形
中,
,E,F分别是边
和对角线
的点,
,
,求
的长;
拓展延伸
(3)如图3,在菱形
中,
交
的延长线于点G.E,F分别是线段
和
上的点,
,
,求
的长.
(1)如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345c91c9e67e6ee00a872078ab17f094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f2a0ee47f2bfbf68c8a1c4da23894e3.png)
问题探究
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b4da8d254b7d76b7615d7f7cd824a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6234f097c4a50340d86d0b9007d69eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051b3a459c945cc6ec4a17bc0e39566f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
拓展延伸
(3)如图3,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfe8c741f56e946c1b454732f8faaa9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4083c581c6027c4b2ae7e3b3749f485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6234f097c4a50340d86d0b9007d69eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41f3062c3f910e418d0ac2bd62303de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/2024/1/29/3421543211474944/3427181465468928/STEM/9c4072c539ce481fa6dab995d30eb73a.png?resizew=481)
您最近一年使用:0次
2024-02-06更新
|
112次组卷
|
2卷引用:陕西省西安市未央区2023-2024学年九年级上学期期末数学试题
7 . (1)如图1,正方形
中,E,F分别是边
和对角线
上的点,
,求证:
;
【思考探究】(2)如图2,矩形
中,
,
,E,F分别是边
和对角线
上的点,
,
,连接
并延长,交边
于G,
交
于H,求
和
的长;
【拓展延伸】(3)如图3,菱形
中,对角线
与
相交于点O,
,
,点F在线段
上,点P在
的延长线上,并且
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345c91c9e67e6ee00a872078ab17f094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32326495961bdc6376b9cb350cc46453.png)
【思考探究】(2)如图2,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f110b51c99b4b70df29e0b642635d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d2231c7a2875ab6d423dff3ead4069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
【拓展延伸】(3)如图3,菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af6c90909440cc2c7e03a228f68ad9e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3362a45b72536c714c5107b0ae94f1c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/24/d43ebf51-3af1-468f-afd4-0a7cf75f41be.jpg?resizew=433)
您最近一年使用:0次
8 . 如图①,在正方形
中,点E,F分别在边
、
上,
于点O,点G,H分别在边
、
上,
.
与
的数量关系:________;
②
的值为 ________;
(2)类比探究,如图②,在矩形
中,
(k为常数),将矩形
沿
折叠,使点C落在
边上的点E处,得到四边形
交
于点P,连接
交
于点O.试探究
与
之间的数量关系,并说明理由;
(3)拓展应用,如图③,四边形
中,
,
,
,
,点E、F分别在边
、
上,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/d1893d78af450a5fa09810537adc2dfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f8513b8f0e768762a51d26bd227c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e15cfa1cd8e8159d9246897678d26d.png)
(2)类比探究,如图②,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ae51f42830225591fa7b9f26052b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)拓展应用,如图③,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8365271d3239f07360fb71e86a8cc3ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c41757ae282475fb29ec1e8e02045d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbfc35fc915ac7d4dc017e60ccdecbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea624cb140001a7e9d7567903a29521.png)
您最近一年使用:0次
2024-01-20更新
|
316次组卷
|
2卷引用:贵州省贵阳市2023-2024学年九年级上学期期末数学试题
9 . 某数学学习小组学习完四边形后进行了如下探究,已知四边形
为矩形,请你帮助他们解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/bffe69d3-dcf4-4aa1-9fe7-908c21d2a5e0.png?resizew=447)
(1)【初步尝试】:他们将矩形
的顶点
、
分别在如图(1)所示的
的边
、
上,顶点
、
恰好落在
的对角线
上,求证:
;
(2)【深入探究】:如图2,若
为菱形,
,若
,求
的值;
(3)【拓展延伸】:如图(3),若
为矩形,
;
且
,请直接写出此时
的值是________(用含有
,
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/bffe69d3-dcf4-4aa1-9fe7-908c21d2a5e0.png?resizew=447)
(1)【初步尝试】:他们将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f90a3773e6944013a0eb41279f332f.png)
(2)【深入探究】:如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a3ae16e3f4a6b8994eb716f8502ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e9fe9bcc967fb43ea66ab995f7c1c9.png)
(3)【拓展延伸】:如图(3),若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3be96420ac78c8621fcb47a45514fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7be5da220f32cb7c8aad9ca5ced32e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a3ae16e3f4a6b8994eb716f8502ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01943be6d886ec97fc1c18e73b0d4ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2024-01-18更新
|
155次组卷
|
3卷引用:广东省深圳市南山区2023-2024学年九年级上学期期末数学试题
名校
10 . 操作初探:
(1)如图1,将正方形纸片
对折,使
与
重合,展平纸片,得到折痕
;再对折,使
与
重合,得到折痕
,展平纸片,连接
,与
交于点
,连接
,
.则
的值为________;
猜想证明:
(2)如图2,将正方形纸片
对折,使
与
重合,展平纸片,得到折痕
;点
在
边上,连接
,与
交于点
,连接
,将
绕点
逆时针旋转,使点
的对应点
'落在对角线
上,连接
.当点
在边
上运动时(点
不与
,
重合),试判断
的形状,并说明理由.
拓展探究:
(3)如图3,在(2)的条件下,延长
交
于点
,连接
,
.当
平分
时,请证明
.
(1)如图1,将正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cafbe2751f4f4c5a8e676818195e9111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f1f15f0de2b8b8da87056362fbea5a.png)
猜想证明:
(2)如图2,将正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bc9983f123701604ea131508334e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/5ed9ac5ae3774f97db118b790aab46ba.png)
拓展探究:
(3)如图3,在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63005a1a1f37e4d90369d71d4f91d2a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd54f390e1c87bff710879a4a31ca93b.png)
您最近一年使用:0次
昨日更新
|
53次组卷
|
2卷引用:2024年陕西省西安市雁塔区陕西师范大学附属中学中考九模数学试题