已知:△ABC与△BDE都是等腰三角形.BA=BC,BD=BE(AB>BD)且有∠ABC=∠DBE.
![](https://img.xkw.com/dksih/QBM/2021/12/6/2866449917648896/2869618695380992/STEM/949bbce2-f916-4678-9785-9def210355b0.png?resizew=577)
(1)如图1,如果A、B、D在一直线上,且∠ABC=60°,求证:△BMN是等边三角形;
(2)在第(1)问的情况下,直线AE和CD的夹角是 °;
(3)如图2,若A、B、D不在一直线上,但∠ABC=60°的条件不变则直线AE和CD的夹角是 °;
(4)如图3,若∠ACB=60°,直线AE和CD的夹角是 °.
![](https://img.xkw.com/dksih/QBM/2021/12/6/2866449917648896/2869618695380992/STEM/949bbce2-f916-4678-9785-9def210355b0.png?resizew=577)
(1)如图1,如果A、B、D在一直线上,且∠ABC=60°,求证:△BMN是等边三角形;
(2)在第(1)问的情况下,直线AE和CD的夹角是 °;
(3)如图2,若A、B、D不在一直线上,但∠ABC=60°的条件不变则直线AE和CD的夹角是 °;
(4)如图3,若∠ACB=60°,直线AE和CD的夹角是 °.
21-22八年级上·上海·期中 查看更多[9]
上海市傅雷中学2021-2022学年八年级上学期期中数学试题(已下线)专题12.25 三角形全等几何模型-手拉手模型(巩固篇)(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)(已下线)专题04 手拉手模型证全等-【微专题】2022-2023学年八年级数学上册常考点微专题提分精练(苏科版)(已下线)专题12 共定点等边三角形的六大结论及应用-【微专题】2022-2023学年八年级数学上册常考点微专题提分精练(苏科版)(已下线)专题1.52 全等三角形几何模型-手拉手模型(巩固篇)(专项练习)-2022-2023学年八年级数学上册基础知识专项讲练(浙教版)(已下线)专题20 共定点等边三角形的六大结论及应用-【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4.27 探索三角形全等几何模型(手拉手模型)(专项练习)-2022-2023学年七年级数学下册基础知识专项讲练(北师大版)(已下线)专题12.25 全等三角形几何模型(手拉手)(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(人教版)(已下线)专题1.25 全等三角形几何模型(手拉手)(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)
更新时间:2021-12-10 17:57:05
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【推荐1】如图,以直角三角形
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的中点
的坐标是
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的值;若不存在,请说明理由.
(3)如图
,过
作
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交
于点
,点
是线段
上一动点,连
交
于点
,当点
在线段
上运动的过程中,
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【推荐2】
中,
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度.
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当
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上,
在线段
上,
,
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______,
______.
(2)如图
当
在线段
上,
在线段
上求
和
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(3)如图
当
在直线
上,
在直线
上,
和
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(1)如图
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名校
【推荐1】问题研究,如图,在等腰
中,
,点
、
为底边
上的两个动点(不与
、
重合),且
.
(1)请在图中找出一个与
相似的三角形,这个三角形是__________;
![](https://img.xkw.com/dksih/QBM/2021/11/21/2856305378844672/2860392825929728/STEM/ca2f79a4-b991-49a6-8c2f-99ecd745fa91.png)
(2)若
,分别过点
、
作
、
的垂线,垂足分别为
、
,且
、
的反向延长线交于点
,若
,求四边形
的面积;
![](https://img.xkw.com/dksih/QBM/2021/11/21/2856305378844672/2860392825929728/STEM/c7e6edd4-fe74-4fbc-9320-c44ffc9eb7ce.png)
问题解决
(3)如图所示,有一个矩形仓库
,其中
米,
米,现计划在仓库的内部的
、
两处分别安装监控摄像头,其中点
在边
上,点
在边
上.设计要求
且
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的长应为多少米?
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(1)请在图中找出一个与
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb674051a60d81aaeffaf116c693289.png)
![](https://img.xkw.com/dksih/QBM/2021/11/21/2856305378844672/2860392825929728/STEM/c7e6edd4-fe74-4fbc-9320-c44ffc9eb7ce.png)
问题解决
(3)如图所示,有一个矩形仓库
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975645d6a73a7326974511ca80b37f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](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/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2021/11/21/2856305378844672/2860392825929728/STEM/86dc2742-5475-446d-b204-1468b1ef2eaf.png)
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【推荐2】在数学课上,王老师组织同学们以“正方形纸片的折叠”为主题开展数学活动.王老师对正方形纸片
进行如下操作:如图1,将正方形纸片沿过点
的一条直线翻折,使点
落在点
处,折痕为
,请同学们在图1的基础上进行探究.
(1)如图2,小明延长
交射线
于点
,连接
,过点
作
的垂线,交
的延长线于点
,则线段
与
的数量关系是________.
【深入探究】
(2)如图3,小华在图2的基础上延长
,交
的延长线于点
,在图3中是否存在一条线段与
相等?若存在,请找出这条线段并给出证明;若不存在,请说明理由.
【拓展应用】
(3)在(2)的条件下,若正方形纸片
的边长为4,当
时,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)如图2,小明延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
【深入探究】
(2)如图3,小华在图2的基础上延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
【拓展应用】
(3)在(2)的条件下,若正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebad5ca8112012886243fd683b7eb930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
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解答题-作图题
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【推荐3】知识背景:我们在《全等三角形》一章中学习了全等三角形的性质和判定、等腰三角形的性质和判定,在一些探究题中经常用以上知识转化角和边,进而解决问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/089415c9-914c-4ce0-8664-9313caf6c461.png?resizew=459)
(1)问题初探:如图
,
中,
,
,点
是
上一点,连接
,以
为一边作
,使
,
,连接
,猜想
和
有怎样的数量关系,并说明理由.
(2)方法迁移:如图
,
是等边三角形,点
是
上一点,连接
,以
为一边作等边三角形
,连接
,则
、
、
之间有怎样的数量关系?
直接写出答案,不写过程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5cc1a387d6ba724f6b9c029807e4bfd.png)
(3)类比再探:如图
,
中,
,
,点
是
上一点,点
是
上一点,连接
,以
一边作
,使
,
,连接
,则
直接写出答案,不写过程,但要求作出辅助线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(4)拓展创新:如图
,
是等边三角形,点
是
上一点,点
是
上一点,连接
,以
为一边作等边三角形
,连接
,猜想
的度数,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/089415c9-914c-4ce0-8664-9313caf6c461.png?resizew=459)
(1)问题初探:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](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/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/931b1589d78dd81a3ecac7b9664b3307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.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/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)方法迁移:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5cc1a387d6ba724f6b9c029807e4bfd.png)
(3)类比再探:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](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/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf469ccdd5d3ea978357af1d60fe4022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e887de7300ee5cb4d40ddfcac9a686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c68f2bdb229950615f72164dec2a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ca928bf4273b2f7a271d33ceed435b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba4c5a16143a851b899ecb4b180887b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(4)拓展创新:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df21b7b7a47318ef2bb069450c39f1cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e359bc7a47c723102813220ef7283177.png)
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【推荐1】(1)【特殊发现】如图1,AB⊥BC于B,CD⊥BC于C,连接BD,过A作AF⊥BD,交BD于E,交BC于F,若BF=1,BC=3,则AB·CD= ;
(2)【类比探究】如图2,在线段BC上存在点E,F,连接AF,DE交于点H,若∠ABC=∠AHD=∠ECD,求证:AB·CD=BF·CE;
(3)【解决问题】如图3,在等腰△ABC中,AB=AC=4,E为AB中点,D为AE中点,过点D作直线DM∥BC,在直线DM上取一点F,连接BF交CE于点H,使∠FHC=∠ABC,问:DF·BC是否为定值?若是,请求出,若不是,请说明理由.
(2)【类比探究】如图2,在线段BC上存在点E,F,连接AF,DE交于点H,若∠ABC=∠AHD=∠ECD,求证:AB·CD=BF·CE;
(3)【解决问题】如图3,在等腰△ABC中,AB=AC=4,E为AB中点,D为AE中点,过点D作直线DM∥BC,在直线DM上取一点F,连接BF交CE于点H,使∠FHC=∠ABC,问:DF·BC是否为定值?若是,请求出,若不是,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/2/26/1890689627758592/1895037967867904/STEM/e32d292384ae437b9ae42ae575595d91.png?resizew=603)
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【推荐2】已知:等腰Rt△ABC和等腰Rt△ADE中,AB=AC,AE=AD,∠BAC=∠EAD=90°
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/293bec02-3067-4a1d-8057-75940e64cf96.png?resizew=531)
(1)如图1,延长DE交BC于点F,若∠BAE=68°,则∠DFC的度数为 ;
(2)如图2,连接EC、BD,延长EA交BD于点M,若∠AEC=90°,求证:点M为BD中点;
(3)如图3,连接EC、BD,点G是CE的中点,连接AG,交BD于点H,AG=9,HG=5,直接写出△AEC的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/293bec02-3067-4a1d-8057-75940e64cf96.png?resizew=531)
(1)如图1,延长DE交BC于点F,若∠BAE=68°,则∠DFC的度数为 ;
(2)如图2,连接EC、BD,延长EA交BD于点M,若∠AEC=90°,求证:点M为BD中点;
(3)如图3,连接EC、BD,点G是CE的中点,连接AG,交BD于点H,AG=9,HG=5,直接写出△AEC的面积.
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解答题-计算题
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【推荐1】已知
是等边三角形,点D为射线
上一动点,连接
,以
为边在直线
右侧作等边
.
上,连接
,若
,且
,求线段
的长;
(2)如图2,点D是
延长线上一点,过点E作
于点F,求证:
;
(3)如图3,若
,点D在射线
上运动,取
中点G,连接
,请直接写出
的最小值.
![](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/03902478df1a55bc99703210bccab910.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/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ee0f04167c17b690c004b2f0df556c.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.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/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
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真题
名校
【推荐2】如图, 已知等边三角形ABC中,点D,E,F分别为边AB,AC,BC的中点,M为直线BC上一动点,△DMN为等边三角形(点M的位置改变时, △DMN也随之整体移动) .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/61d0a0fa-e74d-4336-aafc-9dbd4d0c12d9.png?resizew=393)
(1)如图①,当点M在点B左侧时,请你判断EN与MF有怎样的数量关系?点F是否在直线NE上?都请直接写出结论,不必证明或说明理由;
(2)如图②,当点M在BC上时,其它条件不变,(1)的结论中EN与MF的数量关系是否仍然成立?若成立,请利用图②证明;若不成立,请说明理由;
(3)若点M在点C右侧时,请你在图③中画出相应的图形,并判断(1)的结论中EN与MF的数量关系是否仍然成立?若成立?请直接写出结论,不必证明或说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/61d0a0fa-e74d-4336-aafc-9dbd4d0c12d9.png?resizew=393)
(1)如图①,当点M在点B左侧时,请你判断EN与MF有怎样的数量关系?点F是否在直线NE上?都请直接写出结论,不必证明或说明理由;
(2)如图②,当点M在BC上时,其它条件不变,(1)的结论中EN与MF的数量关系是否仍然成立?若成立,请利用图②证明;若不成立,请说明理由;
(3)若点M在点C右侧时,请你在图③中画出相应的图形,并判断(1)的结论中EN与MF的数量关系是否仍然成立?若成立?请直接写出结论,不必证明或说明理由.
您最近一年使用:0次