如图,在
中,
,
,
,
平分
,交边
于点
,点
是边
的中点.点
为边
上的一个动点.
(1)
______,
______度;
(2)当四边形
为轴对称图形时,求
的长;
(3)若
是等腰三角形,求
的度数;
(4)若点
在线段
上,连接
、
,直接写出
的值最小时
的长度___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/dabf8a46-2c9d-44c0-b623-3b6b46506dd5.png?resizew=206)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386cda9f96731510d52ec18199e18286.png)
(2)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5d53a22172ae2229fba8412c5ba46f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc6b0f69ed7e3633248f6b1c093e874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd601617f0ab200d5c80c37ab41d7323.png)
(4)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3293398a063e808ebdea1d86ee6f1fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
22-23八年级上·吉林松原·期末 查看更多[4]
吉林省松原市2022-2023学年八年级上学期期末数学试题(已下线)专题07 最短路径问题(3类经典题型+优选提升)-【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(人教版)江苏省苏州市昆山市新镇中学2023-2024学年八年级上学期9月月考数学试题江苏省苏州市昆山市新镇中学2023-2024学年八年级上学期11月月考数学试题
更新时间:2023-10-02 08:53:00
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相似题推荐
解答题-证明题
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【推荐1】小明对直角三角形很感兴趣. △ABC中,∠ACB=90°,D是AB上任意一点,连接DC,作DE⊥DC,EA⊥AC,DE与AE交于点E.请你跟着他一起解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/32fb4bae-5ac9-4ff8-8df5-a5c2694487d5.png?resizew=378)
(1)如图1,若△ABC是等腰直角三角形,则DE,DC有什么数量关系?请给出证明.
(2)如果换一个直角三角形,如图2,∠CBA=30°,则DE,DC又有什么数量关系?请给出证明.
(3)由(1)、(2)这两种特殊情况,小明提出问题:如果直角三角形ABC中,BC=mAC,那DE, DC有什么数量关系?请给出证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/32fb4bae-5ac9-4ff8-8df5-a5c2694487d5.png?resizew=378)
(1)如图1,若△ABC是等腰直角三角形,则DE,DC有什么数量关系?请给出证明.
(2)如果换一个直角三角形,如图2,∠CBA=30°,则DE,DC又有什么数量关系?请给出证明.
(3)由(1)、(2)这两种特殊情况,小明提出问题:如果直角三角形ABC中,BC=mAC,那DE, DC有什么数量关系?请给出证明.
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【推荐2】定义:连接三角形一边的中点与另一边上任意一点的线段,叫做这个三角形的拓广中线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/1ce72ed8-5eb2-4363-943d-ba59ba8025e5.png?resizew=161)
(1)填空:三角形的中线 (填“是”或“不是”)拓广中线.
方法指导:如图(1),
是
的拓广中线,其中D是
的中点.如图(2),延长拓广中线
到F,使
,连接
,根据
公理易得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/516ad24803cf836ec69b0fdb6a60fb86.png)
(2)问:线段
与
的数量关系及位置关系是
(3)方法应用:如图,
是
的中线,求证:
;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/af39b09a-22d9-43b1-9aec-fb72ea9a566a.png?resizew=159)
(4)如图,在
中,
,D是
的中点,E、F分别在
上,
,若
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/34f3d7f5-8306-42d0-a14e-ae72091e7960.png?resizew=156)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/1ce72ed8-5eb2-4363-943d-ba59ba8025e5.png?resizew=161)
(1)填空:三角形的中线 (填“是”或“不是”)拓广中线.
方法指导:如图(1),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d88656bd0eaf10f50f8819f78c498b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec76570a0ddc83c103a4b77589d80701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/516ad24803cf836ec69b0fdb6a60fb86.png)
(2)问:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)方法应用:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a0e8d5c50b0e5ed16db7093eb50e39.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/af39b09a-22d9-43b1-9aec-fb72ea9a566a.png?resizew=159)
(4)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9ebe3ed902a71c9b9d6006d70d8256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae1210a744ae636419de68a525faf28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82811402a18b469522c12aec79483fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d96f28426b9621cc9c85a51a755def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/e3ad9507-00b4-4223-9176-80e96b3f289b.png?resizew=146)
您最近一年使用:0次
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名校
【推荐1】如图1,
,
,
轴于点
,
轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/d44d3efe-e84b-4e7f-b72c-57605032a97e.png?resizew=530)
(1)求证:
;
(2)如图2,连接
,
交于点
,连接
,求证:点
为
中点;
(3)如图3,点
为第一象限内一点,点
为
轴正半轴上一点,连接
,
,
且
,点
为
中点.连接
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33558786ad40ed029aeb09da9635cd88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/485f71d039904909dd9277f49e303dd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ea84cba8ccd585ad1da1fd204bc3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2634263d383b0487281fdcf6fe3cc625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/d44d3efe-e84b-4e7f-b72c-57605032a97e.png?resizew=530)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833003cfb9b4fa0b99be6f48e9cd0e75.png)
(2)如图2,连接
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)如图3,点
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40fe2cc764de5fa58e9d90d750c5c528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bbc115577cd400ad9b83b0102440c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788b0ba554e9be016ca135aac9c3e2fd.png)
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【推荐2】综合与实践
【课本再现】在一次课题学习活动中,老师提出如下问题:如图
,四边形
是正方形,点
上边
的中点,
,且
交正方形外角平分线
于点
.请你探究
与
存在怎样的数量关系,并证明你的结论.
经过探究,小明得出结论是
,而要证明结论
,就需要证明
和
所在的两个三角形全等,但
和
显然不全等(一个是直角三角形一个是钝角三角形)考虑到点
是
的中点,小明想到的方法是如图
,取
的中点
,连接
,证明
,从而得到
.
的条件可以为( )
A.
B.
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaff0dae15a94c9f2865c660ea44ce5f.png)
【类比迁移】
(2)如图3,若把条件“点
上边
的中点”改为“点
上边
的任意一点”,其余条件不变,
是否仍然成立
若成立,请写出证明过程,若不成立,请说明理由.
【拓展应用】
(3)已知,四边形
是正方形,点
是直线
上一动点,
,且
交正方形外角平分线
于点
,若
,
,则
长为______.
【课本再现】在一次课题学习活动中,老师提出如下问题:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2d7e4f890104bf0d65c76a4eb24f29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
经过探究,小明得出结论是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5687e49fe4b778c07f1ebe899a9f291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5687e49fe4b778c07f1ebe899a9f291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e5a933a2a0ff3a28009cc989293ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f30cb81835298cb612a828f355060a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13017a6301e3b1264e082293fdf78bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5687e49fe4b778c07f1ebe899a9f291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13017a6301e3b1264e082293fdf78bf8.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef21f6c326b310efdc1bc2f377b2fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9730d8c39620a403e38171c723d3dfea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd03960ade27c927e34ee28cb222615c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaff0dae15a94c9f2865c660ea44ce5f.png)
【类比迁移】
(2)如图3,若把条件“点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5687e49fe4b778c07f1ebe899a9f291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bbee662e242611afdbdae4b8a36a7c.png)
【拓展应用】
(3)已知,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7521601ac1fbc4a52d4fe44be9c8e88c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d527d4795ece4a5756d1cf8dba31e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14a13c67f6211cb9aaa665822ce24c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
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解题方法
【推荐1】在
中,
,
为斜边
上的中线;在
中,
,
,且
.连接
,点
、点
分别为线段
的中点,连接
.
如图1,当点
在
内部时,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546cd05ed2417c4cd110fb711d005e31.png)
如图2,当点
在
外部时,连接
,判断
与
的数量关系,并加以证明;
将图1中的
绕点
旋转,在旋转的过程中,请直接回答:
①
中的
与
的数量关系是否发生了变化?
②若
,当点
三点在同一条直线上时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3278c692383956415d92c2e6cebadf84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34338c04f28c50d6532a28c04ced7d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57a6462598427b46411ac62f4ca32539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea039aa542528318ccf8005699e299d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.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/eb73ae3dc9f67bcf303e7c94a37080d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d05c50ea5f6068e3ebc11ec59723d083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546cd05ed2417c4cd110fb711d005e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f26c2ded122a46dd44b8d8b2740a4ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc979a43123a90b541fb0d161720de88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e899f9f1e24215866a917fedc0dfb95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db0b84c4bba1e131db2083d496cc48e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f26c2ded122a46dd44b8d8b2740a4ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04d4ad5e800a11be16811fca94f137a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8919c4d827007113c5ffa1c8ef821ada.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
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【推荐2】如图,在△ABC中,AB=AC,D、E是△ABC内的两点,AD平分∠BAC,∠EBC=∠E=60°.若BE=7cm,DE=2cm,求BC的长.
![](https://img.xkw.com/dksih/QBM/2019/11/6/2328162808717312/2328802291474432/STEM/135ea9cb08f04288a3cc0c334dbf2a68.png?resizew=95)
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【推荐3】在平面直角坐标系
中,对于不在坐标轴上的点
,给出如下定义:取点
与点
,以
为直角边作等腰
,使
,且点C与点P在同一象限内,则称点C为点P的“对应点”,
为点P的“对应三角形”
(1)已知点P的“对应点”为点C,
①若点P的坐标为
,则点C的坐标为 ;
②若点C的坐标为
,则点P的坐标为 ;
(2)已知点
,过点P作x轴的垂线l,当直线l恰好将点Р的“对应三角形”的面积分成两个相等的部分时,求m,n满足的数量关系;
(3)已知点
,且满足
为定值,点C为点P的“对应点”,若
的最大值为2,直接写出k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dd2c7c5c431d8776ba4fb7acc78c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4776e87dd96658bb5ffe1b09cb98c03.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)已知点P的“对应点”为点C,
①若点P的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0481d24e2af1e0cd348732b9444d1dde.png)
②若点C的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a3619ccbcf65312754a970647014e5.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8d2945996691d56235b1defc0b7cd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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【推荐1】在中,
,点
是
边上一点,过点
作
于点
,
交
延长线于点
.
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d831c9ba6d18774540e2aaa29132fec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/106edf39efdaf005c1fc4abd2718becd.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
①当时,求
的值;
②当与
重叠部分的面积为
时,求
的值.
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【推荐2】如图,在△ABC中,∠ACB=90°,AC=BC,D是AB边上的一个动点,连接CD,点B关于直线CD的对称点为E,射线AE与射线CD交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/dd85a75b-ec3f-4d81-892c-eb946390ae16.png?resizew=186)
(1)连接CE,求证:∠CAE=∠CEA
(2)当BD<AD时,求∠AFC的大小;
(3)若AD=AC,试猜想AE与CD的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/dd85a75b-ec3f-4d81-892c-eb946390ae16.png?resizew=186)
(1)连接CE,求证:∠CAE=∠CEA
(2)当BD<AD时,求∠AFC的大小;
(3)若AD=AC,试猜想AE与CD的数量关系,并证明.
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