【探索发现】
如图1,
是等边三角形,点D为
边上一个动点,将
绕点A逆时针旋转
得到
,连接
.小明在探索这个问题时发现四边形
是菱形.
(2)直接写出线段
之间的数量关系: ;
【理解运用】
如图2,在
中,
于点D.将
绕点A逆时针旋转
得到
,延长
与
交于点G.
(3)判断四边形
的形状,并说明理由;
【拓展迁移】
(4)在(3)的前提下,如图3,将
沿
折叠得到
,连接
,若
,
,求
的长.
如图1,
![](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/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
(2)直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90627f613c39fba21f3a8832a9c0b4bf.png)
【理解运用】
如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8945feca26a1960e7414511524beed.png)
【拓展迁移】
(4)在(3)的前提下,如图3,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e323c08b18488d11bd8f3cd74efa971a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
更新时间:2024-04-24 10:14:09
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解答题-证明题
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【推荐1】如图,在两个等腰直角
和
中,∠ACB = ∠DCE=90°.
(1)观察猜想:如图1,点E在BC上,线段AE与BD的数量关系是 ,位置关系是 ;
(2)探究证明:把
绕直角顶点C旋转到图2的位置,(1)中的结论还成立吗?说明理由;
(3)拓展延伸:把
绕点C在平面内自由旋转,若AC = BC=10,DE=12,当A、E、D三点在直线上时,请直接写出 AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(1)观察猜想:如图1,点E在BC上,线段AE与BD的数量关系是 ,位置关系是 ;
(2)探究证明:把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(3)拓展延伸:把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/0ead0a52-1a93-4dc1-b236-a12d6b63ed8c.png?resizew=299)
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【推荐2】已知:在平面直角坐标系中,等腰Rt△ABC的顶点A、C在坐标轴上运动,且∠ACB=90°,AC=BC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/834a81b8-d618-475c-af9c-2898eb01595c.png?resizew=666)
(1)如图1,当A(0,-2),C(1,0),点B在第四象限时,则点B的坐标为 ;
(2)如图2,当点C在x轴正半轴上运动,点A在y轴正半轴上运动,点B在第四象限时,作BD⊥y轴于点D,试判断
与
哪一个是定值,并说明定值是多少?请证明你的结论.
(3)如图3,当点C在y轴正半轴上运动,点A在x轴正半轴上运动,使点D恰为BC的中点,连接DE,求证:∠ADC=∠BDE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/834a81b8-d618-475c-af9c-2898eb01595c.png?resizew=666)
(1)如图1,当A(0,-2),C(1,0),点B在第四象限时,则点B的坐标为 ;
(2)如图2,当点C在x轴正半轴上运动,点A在y轴正半轴上运动,点B在第四象限时,作BD⊥y轴于点D,试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27bb7723291e7c0a675b44ba9cb5b463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b422af5367d2f3191556ef10f0a4deac.png)
(3)如图3,当点C在y轴正半轴上运动,点A在x轴正半轴上运动,使点D恰为BC的中点,连接DE,求证:∠ADC=∠BDE.
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【推荐1】综合与实践
【问题情境】在数学活动课上,同学们以等边三角形为背景,探究动点运动过程中产生的数学问题.已知
是等边三角形,
,点
是射线
上的一点,以
为边作矩形
(顶点
,
,
,
按逆时针顺序排列),其中
,直线
分别与射线
、直线
交于点
,
.
1.【初步探究】针对老师给出的问题背景,小敏画出了点
与点
重合时的图形,如图
,并提出如下问题,请你解答:
(1)猜想
与
的数量关系,并说明理由;
2.【深入思考】
(2)在小敏研究的基础上,小捷同学画出了点
恰好是
的中点时的图形,如图
,求此时
的值;
3.【拓展延伸】
(3)在点
运动过程中,直接写出当
时
的值.
【问题情境】在数学活动课上,同学们以等边三角形为背景,探究动点运动过程中产生的数学问题.已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.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/3ecc1cb55a57dde481f8dd07ab150676.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58052cd7d89b0d8556f5a082162dc324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
1.【初步探究】针对老师给出的问题背景,小敏画出了点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
(1)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1460aa3d83df61f6c411b34412135451.png)
2.【深入思考】
(2)在小敏研究的基础上,小捷同学画出了点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38045bc304b504929add4ff5b93509e3.png)
3.【拓展延伸】
(3)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1defd7bd31b50762679d1439aa9b67cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38045bc304b504929add4ff5b93509e3.png)
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【推荐2】阅读理解:我们把依次连接任意一个四边形各边中点得到的四边形叫中点四边形.如图1,在四边形ABCD中,E、F、G、H分别是边AB、BC、CD、DA的中点,依次连接各边中点得到中点四边形EFGH.
(1)判断图1中的中点四边形EFGH的形状,并说明理由;
(2)当图1中的四边形ABCD的对角线添加条件______时,这个中点四边形EFGH是矩形;四边形ABCD的对角线添加条件_______时,这个中点四边形EFGH是菱形.
(3)如图2,在四边形ABCD中,点M在AB上且△AMD和△MCB为等边三角形,E、F、G、H分别为AB、BC、CD、AD的中点,试判断四边形EFGH的形状,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966587735220224/2986989430530048/STEM/2e24cdee-03b6-4a40-8a00-62b2a94c5390.png?resizew=473)
(1)判断图1中的中点四边形EFGH的形状,并说明理由;
(2)当图1中的四边形ABCD的对角线添加条件______时,这个中点四边形EFGH是矩形;四边形ABCD的对角线添加条件_______时,这个中点四边形EFGH是菱形.
(3)如图2,在四边形ABCD中,点M在AB上且△AMD和△MCB为等边三角形,E、F、G、H分别为AB、BC、CD、AD的中点,试判断四边形EFGH的形状,并证明你的结论.
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【推荐1】如图1,在正方形
中,
长为
,点E和点F分别是
,
边上一点,且
,连接
,
,
和
相交于点H.
(1)求证:
;
(2)如图2,过B作
,垂足为M.
①若
,求
的长;
②如图3,连接
并延长
交
于点N,若M为
的中点,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/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9b11f2ea112fff1885811bd5bc73cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/62ff11a9-1d09-4b41-8a4b-53369ec439fe.png?resizew=390)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3687a1bab75d23af811247becce2497d.png)
(2)如图2,过B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108091515e9015b6c343778b0d4d4898.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed31eab5ad128362344cc6c2f6bf8c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
②如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/792af680ef408fae3c4b7842ab0f9c10.png)
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【推荐2】某数学兴趣小组开展了一次课外活动,过程如下:如图1,正方形ABCD中,AB=6,将三角板放在正方形ABCD上,使三角板的直角顶点与D点重合.三角板的一边交AB于点P,另一边交BC的延长线于点Q.
(1)求证:DP=DQ;
(2)如图2,小明在图1的基础上作∠PDQ的平分线DE交BC于点E,连接PE,他发现PE和QE存在一定的数量关系,请写出结论并予以证明;
(3)如图3,固定三角板直角顶点在D点不动,转动三角板,使三角板的一边交AB的延长线于点P,另一边交BC的延长线于点Q,仍作∠PDQ的平分线DE交BC延长线于点E,连接PE,若BP=2,请直接写出△DEP的面积.
(1)求证:DP=DQ;
(2)如图2,小明在图1的基础上作∠PDQ的平分线DE交BC于点E,连接PE,他发现PE和QE存在一定的数量关系,请写出结论并予以证明;
(3)如图3,固定三角板直角顶点在D点不动,转动三角板,使三角板的一边交AB的延长线于点P,另一边交BC的延长线于点Q,仍作∠PDQ的平分线DE交BC延长线于点E,连接PE,若BP=2,请直接写出△DEP的面积.
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844537970827264/2844911154880512/STEM/1941260b4f7146caac19af6ae8f7f62c.png?resizew=554)
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【推荐1】如图,
中,
,
,点
为平行四边形边
上一动点,连接
,将
绕点
逆时针旋转
得线段
,点
的对应点是
.
①当
,点
落在直线
或直线
上时,直接写出此时
的长为 ;
②连接
,求证:
的面积是一个定值.
(2)如图2,当
时,连接
,将
绕点
逆时针旋转
得线段
,点
的对应点是
.直接写出
是等腰三角形时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d527d4795ece4a5756d1cf8dba31e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57612cb0e5a7e43d51cc33738bb7550d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.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/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143e346ac3950f60077291dda2be73c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2ab8b9338fbcdf04d0e703337ea34f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.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/80672dda9430cb42b3136bcb1b67bbad.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf9d83e22c28a9ac56d5a8b6d02b104.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19343455668abab3ca3b05aa2cf616c2.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b6e6b9a38932e653e053f1895b1bae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7096fdcee49451970e84214dee5c2e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37ea9f8c4f8d1853769337277b6af3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d48943db264c08adaf6ae0766fd56459.png)
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名校
【推荐2】如图(1)正方形ABCD和正方形AEFG,边AE在边AB上,AB=12,AE=6
.将正方形AEFG绕点A逆时针旋转α(0°≤α≤45°)
(1)如图(2)正方形AEFG旋转到此位置,求证:BE=DG;
(2)在旋转的过程中,当∠BEA=120°时,试求BE的长;
(3)BE的延长线交直线DG于点Q,当正方形AEFG由图(1)绕点A逆时针旋转45°,请直接写出旋转过程中点Q运动的路线长;
(4)在旋转的过程中,是否存在某时刻BF=BC?若存在,试求出DQ的长;若不存在,请说明理由.(点Q即(3)中的点)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(1)如图(2)正方形AEFG旋转到此位置,求证:BE=DG;
(2)在旋转的过程中,当∠BEA=120°时,试求BE的长;
(3)BE的延长线交直线DG于点Q,当正方形AEFG由图(1)绕点A逆时针旋转45°,请直接写出旋转过程中点Q运动的路线长;
(4)在旋转的过程中,是否存在某时刻BF=BC?若存在,试求出DQ的长;若不存在,请说明理由.(点Q即(3)中的点)
![](https://img.xkw.com/dksih/QBM/2019/5/22/2209076762820608/2209729547132928/STEM/114b25029871465381d02e66140e9f4b.png?resizew=443)
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【推荐3】下面是某数学兴趣小组探究“三角形旋转动态分析”时对一道试题的分析,请仔细阅读,并完成相应的任务.
试题:
任务:
(1)小亮得到
的依据①是_________(从“
”“
”“
”“
”中选择一个).
(2)小明对原试题的条件进行了适当变动,将“点D为边
上一点”改为“点D为射线
上一点”其它条件不变,如图2,此时“
”是否仍然成立?并说明理由.
如图3,等边
中,
,点D为射线
上一点,将线段
绕点A逆时针旋转
得线段
,连接
,请直接写出线段
的长.
试题:
如图1,![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 判断线段 ![]() ![]() |
…… ∵ ![]() ![]() ∴ ![]() …… 故 ![]() |
(1)小亮得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b6bc70ba0b3deab2eddc0d2248b3186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2ba04decd9d9204ec64d567af55721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9970629e91021aa64fb871c83746418c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec76570a0ddc83c103a4b77589d80701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cbfd199e0ba3e1ec7016a44454e7a3c.png)
(2)小明对原试题的条件进行了适当变动,将“点D为边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63dd9e43e4673d26f3a8c24878cd5a6c.png)
如图3,等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e511e9c2e0b7b2c7627224c856535c82.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/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f27763f6dcbae61e12858d1893034164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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