1 . 小明同学在做作业时,遇到如下问题:如图1,已知:等边
,点
在
上,以
为边作等边
,连接
,求证:
.
(1)请你解答小明的这道题;
(2)在这个问题中,当
在
上运动时,点
是否在一条线段上运动?(直接答“是”或“不是”)
(3)如图2,正方形
的边长为2,
是直线
上的一个动点,以
为边作正方形
按逆时针排列).当
在直线
上运动时,点
是否在一条直线上运动?如果是,请你画出这条直线并证明;如果不是,也请说明理由;
(4)连接
,
.
①求证:
是定值;
②求
的最小值(直接写出答案即可).
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc59641467014c8be833e0781f04b1b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/55ff51e9-edb6-4c51-8fc2-434eabf1c771.png?resizew=472)
(1)请你解答小明的这道题;
(2)在这个问题中,当
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)如图2,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/6d996e5c352e217682294edd7a3ba8a9.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/895dc3dc3a6606ff487a4c4863e18509.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d054c2fdcd0de4c0f89f6b138301281f.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e21a8039a5ed0803caf60838d12c581c.png)
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名校
2 . 教材呈现:如图是华师版八年级上册数学教材第94页的部分内容.
请根据所给教材内容,结合图①,写出“线段垂直平分线的性质定理”完整的证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/875f570a-a6ce-4aff-8e32-73beb1b9c1a2.png?resizew=461)
定理应用:
(1)如图②,在
中,
、
的垂直平分线分别交
于点
、
,垂足分别为
,
,
,则
的周长为__________.
(2)如图③,在
中,
,
,
、
分别是
、
上任意一点,若
,
的面积为
,则
的最小值是__________.
2.线段垂直平分线 我们已经知道线段是轴对称图形,线段的垂直平分线是线段的对称轴,如图,直线 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 线段垂直平分线的性质定理线段垂直平分线上的点到线段两端的距离相等. 已知:如图, ![]() ![]() ![]() ![]() ![]() 求证: ![]() ![]() 分析:图中有两个直角三角形 ![]() ![]() ![]() 请写出完整的证明过程. |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/875f570a-a6ce-4aff-8e32-73beb1b9c1a2.png?resizew=461)
定理应用:
(1)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/c3b8a4b0e72a4de1da975168b243a325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)如图③,在
![](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/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb41f8ded9116e83f87a8e43b0ce7f8.png)
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3 . 在矩形ABCD中,点P是射线BC上一动点,点B关于直线AP的对称点为E,直线PE与直线CD交于点F.
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922438991724544/2923895177887744/STEM/194a673d-4fd1-40af-8d71-464af81c030c.png?resizew=130)
(1)如图1,当A,C,E共线时,若
,判断△ACF的形状,并证明;
(2)若当点P在线段BC上的某个位置时(不与B,C重合),有
,求证:当点P在BC延长线上任意位置时,都有
.
![](https://img.xkw.com/dksih/QBM/2022/2/23/2922438991724544/2923895177887744/STEM/194a673d-4fd1-40af-8d71-464af81c030c.png?resizew=130)
(1)如图1,当A,C,E共线时,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
(2)若当点P在线段BC上的某个位置时(不与B,C重合),有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed04f391889f1481ebaa308193ce0a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed04f391889f1481ebaa308193ce0a7.png)
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4 . 如图,在
中,
,
,点
,
分别为边
,
上一点,
与
相交于点
,将线段
绕点
顺时针旋转得到线段
,点
恰好在线段
的延长线上![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e1d0f65817ba32a732040518f41440.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/531e3221-31d0-41eb-82f0-d4ebc33db25c.png?resizew=384)
(1)若
,
,求
的长;
(2)若
,
为
的中点,猜想线段
和
之间存在的数量关系,并证明你的猜想;
(3)在(2)的条件下,将
沿直线
翻折至
所在平面内得到
,点
在线段
上,且
,点
是线段
上一动点,将
沿直线
翻折至
所在平面内得到
,点
为线段
上一动点,当
取得最小值时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b173ac8cc4ac4f1c9e1daaa605fbb27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e1d0f65817ba32a732040518f41440.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/531e3221-31d0-41eb-82f0-d4ebc33db25c.png?resizew=384)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de13b90ee61450dcf26f2f04b010b3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eac6f98ed81727dc5f6699ea5117fff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)在(2)的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e78042a384255038de485fd7bc0839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95aeb49e93f5685c507de4f04e3d699f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d345376fe3af68bd6ceda2fa1d9dc8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a8588dc60a543ad70d6bc0d263dbd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d345376fe3af68bd6ceda2fa1d9dc8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66fb4ea1736d12434e15b7fd100f1b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f8bee7f10c86cd256f13187017faf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/941eaa18be2d3b611ece19454eca8604.png)
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5 . (1)呈现:如图1,等腰直角三角形
的直角顶点
在直线
上,分别过点
作
于
,
于
,则有![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
.请你证明这个结论;
(2)应用:如图2,已知
,
,把线段
绕点
顺时针方向旋转
后得到线段
,求点
的坐标;
(3)拓展:如图3,直线
直线
,垂足为
,点A是直线
上一定点,且
,点
在直线
上运动,以
为边作等腰
,
(点
呈顺时针排列),当点
在直线
上运动时,点
也随之运动.在点
的运动过程中,
的最小值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13b505788d3d02bf232ac637fc3a8ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e72d26eae9a5470ac982541c609b109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b9b8d99b9de52b51d1e5e223da3a96.png)
(2)应用:如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c59f0e35b7ae5206e45878934482b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e5eea5f7f98ca8632358b7e49ceb25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)拓展:如图3,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9df740160690029ac1e730c85f20347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2d3f02cb9007cd4a90ea30f6dd8181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc5cd5a1664ef7692e2b1b18b30d451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/accea8f3-f141-4296-9fe4-1f986e43b296.png?resizew=605)
您最近一年使用:0次
2023-08-29更新
|
157次组卷
|
4卷引用:浙江省湖州市长兴县2022-2023学年八年级上学期12月月考数学试题
浙江省湖州市长兴县2022-2023学年八年级上学期12月月考数学试题(已下线)专题3.11 轴对称与坐标变化(分层练习)(培优练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(北师大版)(已下线)专题5.15 坐标与图形变换——轴对称(分层练习)(培优练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(苏科版)浙江省金华市兰溪市第八中学2023-2024学年上学期学习能力调查(一)八年级数学试卷
6 . 材料:在处理有动点的几何问题时,寻求与动点相关的常量,可以帮我们分析出动点的运动轨迹,进而解决问题.如果动点C与定线段
所成的
为常量,那么点C的运动轨迹为射线
,如图A.如果动点G与定直线
的距离
为常量,动点G的运动轨迹即为过点G且与直线
平行的直线l,如图B.
中,
,点P在边
上且
,点M为直线
上的一动点,以
为直角边作等腰
,
,点N在直线
的右下方,连接
,当点M在边
上运动时,
(2)求
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b7372d65c783ac6f4259dd44e2c9316.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e208df4ca0d8e9a45a84fcfe1f6c6e.png)
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7 . 如图,点P是正方形ABCD的内部一点,点B关于直线AP的对称点E落在正方形外部,连接BE,DE,AE,其中BE与AP交于点O,延长ED交直线AP于点F,连接BF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/5321a5bb-ba89-4df1-b9bd-c2a97c8dc889.png?resizew=312)
(1)AE和AD的数量关系为________;
(2)①若
,则
________
;
②若
,求AF;
(3)若
,猜想线段AB,FE,FD之间的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/5321a5bb-ba89-4df1-b9bd-c2a97c8dc889.png?resizew=312)
(1)AE和AD的数量关系为________;
(2)①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d1d93fde9dca78db40308469710534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa0f4484f901bb727fbeae1a044d714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14a385fafa4e934ba89e4e3f79c45c41.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eca2dcc1591173a6e6675708ec4e510.png)
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8 . ( 定义:长宽比为
∶1(n为正整数)的矩形称为
矩形.下面,我们通过折叠的方式折出一个
矩形,如图a所示.
操作1:将正方形ABEF沿过点A的直线折叠,使折叠后的点B落在对角线AE上的点G处,折痕为AH.
操作2:将FE沿过点G的直线折叠,使点F、点E分别落在边AF,BE上,折痕为CD.则四边形ABCD为
矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/f12b9ea5-beaf-439b-b043-af20b6a4922b.png?resizew=427)
(1)证明:四边形ABCD为
矩形;
(2)点M是边AB上一动点.
①如图b,O是对角线AC的中点,若点N在边BC上,OM⊥ON,连接MN.求ON:OM的值;
②若AM=AD,点N在边BC上,当△DMN的周长最小时,求NB:CN的值;
③连接CM,作BR⊥CM,垂足为R.若AB=2
,则DR的最小值=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d249094ecb996458e35182d6b461299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d249094ecb996458e35182d6b461299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
操作1:将正方形ABEF沿过点A的直线折叠,使折叠后的点B落在对角线AE上的点G处,折痕为AH.
操作2:将FE沿过点G的直线折叠,使点F、点E分别落在边AF,BE上,折痕为CD.则四边形ABCD为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/f12b9ea5-beaf-439b-b043-af20b6a4922b.png?resizew=427)
(1)证明:四边形ABCD为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(2)点M是边AB上一动点.
①如图b,O是对角线AC的中点,若点N在边BC上,OM⊥ON,连接MN.求ON:OM的值;
②若AM=AD,点N在边BC上,当△DMN的周长最小时,求NB:CN的值;
③连接CM,作BR⊥CM,垂足为R.若AB=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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9 . 综合与实践折纸是一项有趣的活动,同学们小时候都玩过折纸,可能折过小动物、飞机、小船等,折纸活动也伴随着我们初中数学的学习.在折纸过程中,既可以得到一些美丽的图形,同时还蕴含着丰富的数学知识.
.
活动一:
(1)如图②,折叠矩形纸片ABCD,使点A落在点C处,点D落在点
处,展开得到折痕EF交AB边于点E,交CD边于点F,则
_______;
活动二:
(2)如图③,连接图②中的AC交EF于点O,连接AF.猜想四边形AECF是什么特殊四边形,并证明你的猜想;
活动三:
(3)如图④,折叠矩形纸片ABCD,使点A落在BC边的中点
处,点D落在点
处,展开得到折痕EF交AB边于点E,交CD边于点F,则
_______,
_______;
活动四:
(4)如图⑤,若点A落在靠近点B的BC的四等分点
处,即
,则
与
相似吗?若相似,请直接写出相似比;若不相似,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3afa457b84df5b4851247cb6b6d78b8b.png)
活动一:
(1)如图②,折叠矩形纸片ABCD,使点A落在点C处,点D落在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb12b7108cfeb1bf74335c6dc29dd33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
活动二:
(2)如图③,连接图②中的AC交EF于点O,连接AF.猜想四边形AECF是什么特殊四边形,并证明你的猜想;
活动三:
(3)如图④,折叠矩形纸片ABCD,使点A落在BC边的中点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7856b843caf384fca612ce663f21c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb12b7108cfeb1bf74335c6dc29dd33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f76e37d6e6b182896ccaaa187cfe07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffba64153efc1cef19e9e1c7d87fa02.png)
活动四:
(4)如图⑤,若点A落在靠近点B的BC的四等分点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7856b843caf384fca612ce663f21c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56024088e7d1e3bd5f5d17f4ddae48b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ebc5c6e6ea7616b0054ee137d827dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438bf2134641f9950932bd667188d63c.png)
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10 . 如图,在等边
中,
是
边上一点,
,点
是点
关于直线
的对称点,点
在直线
上(点
不与点
重合),且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/3fc1348a-11b3-4d55-8871-a801e70eebaa.png?resizew=119)
(1)依题意补全图形,直接写出
的度数(用含有
的代数式表示);
(2)探究
、
、
满足的等量关系,并证明;
(3)若点
在
的延长线上,其余条件不变,直接写出
、
、
满足的等量关系.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40bddb4d329d6708b25ed900fe9b459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/a0ed1ec316bc54c37c4286c208f55667.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b282c521e0f3406b61964ed80f7a56bd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/3fc1348a-11b3-4d55-8871-a801e70eebaa.png?resizew=119)
(1)依题意补全图形,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c9d865dfc0688f256373cae999cdfef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
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