如图,正方形
中,连接
,点E是
延长线上一点,且
,连接
,
(1)尺规作图:在线段
上求作一点F,使得
;(保留作图痕迹,不写作法)
(2)在(1)的条件下,连接
,
,试判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9896780c93626546ca64459a964f48d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/51126c10-3b93-42ce-9b52-f75d4e4734eb.png?resizew=180)
(1)尺规作图:在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ce838f38419e8781d63b3417cac5e4.png)
(2)在(1)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
更新时间:2023-07-05 19:11:29
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在两个等腰直角
和
中,
,连结
,
.
.
(2)若
,
,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06c507be7b5e750fe4d081ff12d39c7d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab47a785e0687f42e885e11497b7e969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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解答题-作图题
|
适中
(0.65)
【推荐1】如图所示,已知线段
,
,求作等腰三角形,使腰长为
,底上的高为
(
,尺规作图,不写作法,保留作图痕迹).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-作图题
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适中
(0.65)
【推荐2】如图,在平面直角坐标系
中,已知点
,点
.
(1)尺规作图,求作一点
,使点
同时满足下列条件(保留作图痕迹,不写作法)
①点
到
、
两点的距离相等.
②点
到
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(2)直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dc24c48d8b988443cc189488e8185d.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/a2207946-e0f3-46d7-ad3b-c94ac4605c0e.png?resizew=164)
(1)尺规作图,求作一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e080cd6923aa79d1226e1f48062b936.png)
(2)直接写出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-作图题
|
适中
(0.65)
【推荐3】《几何原本》是一部集前人思想和欧几里得个人创造性一体的不朽之作,把人们公认的一些事实列成定义、公理和公设,用它们来研究各种几何图形的性质,从而建立了一套从定义、公理和公设出发,论证命题得到定理的几何学论证方法.小迪同学在学习过程中产生了一个猜想:“如果三角形一边上的中线的长度等于所在边长度的一半,那么这个三角形是直角三角形.”
![](https://img.xkw.com/dksih/QBM/2023/2/17/3176800629473280/3178017467211776/STEM/5acf6ae8ccca454689df2e838fb5994c.png?resizew=180)
(1)请你用尺规作图,在图中作出线段
的中点
,并连接
.(保留作图痕迹)
(2)请你结合图形,将小迪猜想的命题写成已知、求证.
已知:
求证:
为直角三角形.
(3)补全上述猜想的证明过程.
证明:∵点
是线段
的中点,
∴ ,
又∵
,
∴
,
在
中,∵
,
∴
,(___________)(填推理的依据),
同理,在
中, = .
在
中
∵
.
∴ +
,
∵在
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d819045ab9ed2b42d3f6f13262464795.png)
∴在
中,
,
∴
为直角三角形.
![](https://img.xkw.com/dksih/QBM/2023/2/17/3176800629473280/3178017467211776/STEM/5acf6ae8ccca454689df2e838fb5994c.png?resizew=180)
(1)请你用尺规作图,在图中作出线段
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)请你结合图形,将小迪猜想的命题写成已知、求证.
已知:
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)补全上述猜想的证明过程.
证明:∵点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
∴ ,
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd72e399cbc9beead45a955482dd315.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/928ce069fc1bd5c8a8592e1e3e9df5d3.png)
同理,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d398aab43c12b4418393d8f61300aba.png)
∴ +
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c06422e1d55db3077257af113df4bb.png)
∵在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d819045ab9ed2b42d3f6f13262464795.png)
∴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/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知在正方形
中,对角线
与
交于点
,点
在线段
上,联结
并延长交边
于点
,点
在线段
上,且
,联结
与线段
交于点
,联结
、
.
![](https://img.xkw.com/dksih/QBM/2021/3/19/2681499292606464/2684114962489344/STEM/0f47b0e9-09bf-4f43-bab3-90c3f82ddc43.png)
(1)如果
,求证:四边形
是菱形;
(2)如果
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e7d95578c9ba65c367d33948b6f4d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/2021/3/19/2681499292606464/2684114962489344/STEM/0f47b0e9-09bf-4f43-bab3-90c3f82ddc43.png)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d7d35c1298c3385d0baa5a51222fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44716bbdc4b913f60470ca02350db35.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b02bd90946c4b02a4ce6e85d07c229e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4499ea57e1e5d3a5abb9bcac60daad54.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
真题
名校
【推荐2】已知正方形ABCD与正方形CEFG,M是AF的中点,连接DM,EM.
(1)如图1,点E在CD上,点G在BC的延长线上,请判断DM,EM的数量关系与位置关系,并直接写出结论;
(2)如图2,点E在DC的延长线上,点G在BC上,(1)中结论是否仍然成立?请证明你的结论;
(3)将图1中的正方形CEFG绕点C旋转,使D,E,F三点在一条直线上,若AB=13,CE=5,请画出图形,并直接写出MF的长.
(1)如图1,点E在CD上,点G在BC的延长线上,请判断DM,EM的数量关系与位置关系,并直接写出结论;
(2)如图2,点E在DC的延长线上,点G在BC上,(1)中结论是否仍然成立?请证明你的结论;
(3)将图1中的正方形CEFG绕点C旋转,使D,E,F三点在一条直线上,若AB=13,CE=5,请画出图形,并直接写出MF的长.
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解答题-问答题
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适中
(0.65)
【推荐1】一个等腰三角形的一边长为5,周长为23,求其他两边的长.
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