已知线段
于点
,点
在直线
上,分别以
、
为边作等边三角形
和等边三角形
,直线
交直线
于点
.
(1)当点
在线段
上时,如图①,直接写出
,
,
之间的关系 .
(2)当点
在线段
的延长线上时,如图②,当点
在线段
的延长线上时,如图③,请分别写出线段
、
、
之间的数量关系,在图②、图③中选一个进行证明.
(3)在(1)、(2)的条件下,若
,
,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae781496bb5bc79b67abced9aa3cd0c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)在(1)、(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6392415f04998a43c34b9e9a95fdc347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a028fd5b281ef168702a803baca6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/10/27264096-ab6a-4119-9b44-c2664f1f2483.jpg?resizew=411)
20-21八年级下·河南郑州·期中 查看更多[7]
河南省郑州市第四中学、京广实验学校联考2020-2021学年八年级下学期期中数学试题河南省郑州市中原区第十九初级中学2022-2023学年八年级下学期期中数学试题(已下线)专题13.4 等边三角形的性质与判定【十大题型】-2023-2024学年八年级数学上册举一反三系列(华东师大版)(已下线)专题13.3 等边三角形的性质与判定【十大题型】-2023-2024学年八年级数学上册举一反三系列(人教版)(已下线)专题2.3 等边三角形的性质与判定【十大题型】-2023-2024学年八年级数学上册举一反三系列(浙教版)(已下线)专题2.3 等边三角形的性质与判定【十大题型】-2023-2024学年八年级数学上册举一反三系列(苏科版)(已下线)专题15.3 等边三角形的性质与判定【十大题型】-2023-2024学年八年级数学上册举一反三系列(沪科版)
更新时间:2023-09-03 21:41:18
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解答题-证明题
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较难
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【推荐1】操作发现:如图,已知△ABC和△ADE均为等腰三角形,AB=AC,AD=AE,将这两个三角形放置在一起,使点B,D,E在同一直线上,连接CE.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/cb4c5b44-6c99-4715-bcf5-4a2149591007.png?resizew=356)
(1)如图1,若∠ABC=∠ACB=∠ADE=∠AED=55°,求证:△BAD≌△CAE;
(2)在(1)的条件下,求∠BEC的度数;
拓广探索:(3)如图2,若∠CAB=∠EAD=120°,BD=4,CF为△BCE中BE边上的高,请直接写出EF的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/cb4c5b44-6c99-4715-bcf5-4a2149591007.png?resizew=356)
(1)如图1,若∠ABC=∠ACB=∠ADE=∠AED=55°,求证:△BAD≌△CAE;
(2)在(1)的条件下,求∠BEC的度数;
拓广探索:(3)如图2,若∠CAB=∠EAD=120°,BD=4,CF为△BCE中BE边上的高,请直接写出EF的长度.
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解答题-证明题
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【推荐2】综合与实践:
问题情境:在矩形ABCD中,点E为BC边的中点,将△ABE沿直线AE翻折,使点B与点F重合,直线AF交直线CD于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/fc643f7e-295c-42df-b549-abd288a05d9a.png?resizew=281)
特例探究 实验小组的同学发现:
(1)如图1,当AB=BC时,AG=BC+CG,请你证明该小组发现的结论;
(2)当AB=BC=4时,求CG的长;
延伸拓展:(3)实知小组的同学在实验小组的启发下,进一步探究了当AB∶BC=
∶2时,线段AG,BC,CG之间的数量关系,请你直接写出实知小组的结论:___________.
问题情境:在矩形ABCD中,点E为BC边的中点,将△ABE沿直线AE翻折,使点B与点F重合,直线AF交直线CD于点G.
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特例探究 实验小组的同学发现:
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解答题-问答题
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名校
【推荐1】已知抛物线
(b,c为常数,
)的顶点为P,与x轴相交于A,B两点(点A在点B的左侧),与y轴相交于点C,抛物线上的点M的横坐标为m,且
,过点M作
,垂足为N.
(1)若
,
.
①点P坐标为______;点A的坐标为______;
②点G为抛物线
对称轴上的一点,则
的最小值为______;
③当
时,求m的值;
(2)若点A的坐标为
,且
,当
时,求点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e4cc00c283519973f7f8e1274b5c733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dfff9ab01050b9a3e19e78a33db34a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66fae8e33cd86fa8dab72704eaafe1ba.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f06408895febc126c2ae409e807349c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
①点P坐标为______;点A的坐标为______;
②点G为抛物线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683f81d1f487d8dd6d965f11fb1bd8fb.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ea2deac8c6abf69c8279ce5705752b3.png)
(2)若点A的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe592db9ab31d7f0eab4a9e438fa63e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a0a9c342c354de49cb9308518caa33.png)
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【推荐2】如图,在△ABC中∠ABC=∠ACB,BO平分∠ABC,CO平分∠ACB.若过点O作直线EF和边BC平行,与AB交于点E,与AC交于点F,则线段EF和EB,FC之间有怎样的数量关系并证明?
![](https://img.xkw.com/dksih/QBM/2017/3/15/1644437786361856/1665129159639040/STEM/8ca7fd04-e1cb-446c-b804-2d8eaf1ef501.png)
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解答题-证明题
|
较难
(0.4)
【推荐1】如图,点
是等边
内一点,
,
.以
为一边作等边三角形
,连接
、
.
![](https://img.xkw.com/dksih/QBM/2020/11/26/2601265839128576/2604079273099264/STEM/bd13cdf41b1b4c7ca80c6866e44ba1ab.png?resizew=160)
(1)求证:
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(2)求
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(3)当
为多少度时,
是等腰三角形?
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2020/11/26/2601265839128576/2604079273099264/STEM/bd13cdf41b1b4c7ca80c6866e44ba1ab.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4309332ec2c963e9b72fcb4ac85207ca.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781ccc2cdcc1683d5a1366ebce65e689.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
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【推荐2】如图,
内接于半圆O,已知AB是半圆O的直径.
,
平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
,分别交半圆O和
于点D,E,过点D作
,垂足为点H,交
于点F.
(1)求证:
;
(2)连接
交
于点G,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
,分别交半圆O和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a7cf70f8772d8fea4599b18df2c88f.png)
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(1)求证:
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(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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