如图,点D、E在△ABC的边上,AD=AE,BD=CE.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/6ebd95b1-66c6-4562-83a1-6923f909ac24.png?resizew=176)
(1)求证:AB=AC;
(2)当∠DAE=∠B时,直接写出图中所有等腰三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/6ebd95b1-66c6-4562-83a1-6923f909ac24.png?resizew=176)
(1)求证:AB=AC;
(2)当∠DAE=∠B时,直接写出图中所有等腰三角形.
更新时间:2021-08-18 10:21:32
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【推荐1】如图,已知点E,C在线段BF上,且BE=CF,AB∥DE,AC∥DF,
AC与DE相交于点O,求证:S四边形ABEO=S四边形OCFD.
![](https://img.xkw.com/dksih/QBM/2018/12/1/2087439930368000/2091773910155264/STEM/6c29ac33618c47d8b721a60d8b4e2910.png?resizew=5)
![](https://img.xkw.com/dksih/QBM/2018/12/1/2087439930368000/2091773910155264/STEM/5ed6fed886314f48866541f7f463bdd0.png?resizew=136)
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【推荐2】已知,在等边△ABC 中,D、E 分别为 AC、BC 边上的点,BE=CD,连接 AE、BD 相交于点 F.
(1)如图 1,求∠AFD的度数;
(2)如图 2,过点A作AH⊥BD于H,若EF=HD,求证:BF=HF;
(3)如图 3,在(2)的条件下,延长BD到点M,连接AM,使∠AMB=∠ABM,若EF=2, AF=10,求DM长.
(1)如图 1,求∠AFD的度数;
(2)如图 2,过点A作AH⊥BD于H,若EF=HD,求证:BF=HF;
(3)如图 3,在(2)的条件下,延长BD到点M,连接AM,使∠AMB=∠ABM,若EF=2, AF=10,求DM长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/f91bebc8-a785-4bd5-a24b-1226856251ee.png?resizew=502)
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【推荐1】如图,在
中,
,点
在
上运动,点
在
上,
始终保持与
相等,
的垂直平分线
分别交AB于点
,交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2021/9/11/2805672892022784/2805844667875328/STEM/8881f41a88d145d69bd1cdbc12081dd5.png?resizew=272)
(1)判断
与
的位置关系,并说明理由.
(2)若
,
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2021/9/11/2805672892022784/2805844667875328/STEM/8881f41a88d145d69bd1cdbc12081dd5.png?resizew=272)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae8221601c7bd5c51fd520615581fa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐2】综合与实践:
问题情境:
数学课上,老师组织同学们开展了一次项目学习,项目内容:已知在
中,
,
,点D为直线
上一动点(点D不与点A,B重合).连接
,以点C为旋转中心,将
逆时针旋转
得到
,连接
.
试探究:线段
之间的数量关系.
操作发现:
活动中,大家积极思考,通过操作发现,共有以下三种图形位置关系:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/30/3b7b1f72-ca50-4e41-83a2-b65736446ebd.png?resizew=483)
①如图1,点D在线段
上
②如图2,点D在线段
的延长线上
③如图3,点D在线段
的延长线上
(1)请直接写出线段
之间的数量关系;
拓展应用:
(2)如图4,当点D在线段
的延长线上时,若
,线段
的中点为F,连接
,求
的长度.
问题情境:
数学课上,老师组织同学们开展了一次项目学习,项目内容:已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
试探究:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77224842c167dc3a35c8056f36053a24.png)
操作发现:
活动中,大家积极思考,通过操作发现,共有以下三种图形位置关系:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/30/3b7b1f72-ca50-4e41-83a2-b65736446ebd.png?resizew=483)
①如图1,点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②如图2,点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
③如图3,点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
(1)请直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77224842c167dc3a35c8056f36053a24.png)
拓展应用:
(2)如图4,当点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/30/699bc5d6-805c-41fe-90b5-21ca5ac426fb.png?resizew=211)
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