如图1,
中,
,
,
,点D为斜边上动点.
(1)如图2,过点D作
交CB于点E,连接AE,当AE平分
时,求CE;
(2)如图3,在点D的运动过程中,连接CD,若
为等腰三角形,直接写出AD的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cad7b03f934718b18ce34cdf0b85863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30912a21aa3d8412f8e020e13ce4cd10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e76faa363d8d18fce35d03cb8b32a414.png)
(1)如图2,过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
(2)如图3,在点D的运动过程中,连接CD,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
18-19八年级上·广东深圳·期中 查看更多[14]
【区级联考】广东省深圳市宝安、罗湖、福田、龙华四区2018-2019学年八年级上学期期中联考数学试题人教版初中数学八年级下册第十七章勾股定理山东省德州市宁津县第四实验中学2018-2019学年八年级下学期第一次月考数学试题辽宁省鞍山市铁西区2018-2019学年八年级下学期5月月考数学试题四川省成都市温江区成都七中实验学校2019-2020学年八年级上学期期中数学试题(已下线)【新东方】初中数学720【2019年】【初二上】河南省洛阳市高新区三山学校2018-2019学年八年级下学期期中数学试题河南省平顶山市三六联校2021-2022学年八年级上学期第一次月考试题湖南省永州市道县朝阳学校2021-2022学年八年级下学期第一次月考数学试题(已下线)第一章 勾股定理 (B卷·能力提升练)-【单元测试】2022-2023学年八年级数学上册分层训练AB卷(北师大版)广东省茂名市高州十校联盟2022-2023学年八年级上学期学情练习数学试题湖北省黄冈市武穴市、浠水县部分学校2022-2023学年八年级下学期月考数学试卷(3月份)四川省巴中市巴州区巴州区第十一小学校2022-2023学年八年级下学期3月月考数学试题甘肃省武威市古浪县土门九年一贯制学校2023-2024学年八年级下学期期中数学试题
更新时间:2021-10-09 14:03:58
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解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,点
,
,
,
在一条直线上,
,
,
.求证:
.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐2】已知,∠MON=90°,点A在边OM上,点P是边ON上一动点,将线段AP绕点A逆时针旋转60°,得到线段AB,连接OB,BP.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/a9df6493-a8d0-4d53-9ca4-4ecc7d1441da.png?resizew=485)
(1)如图1,当∠OAP=45°时,试判断OB与AP的位置关系: ;
(2)如图2,当∠OAP=60°时,OA=2时,求线段OB的长度;
(3)如图3,当∠OAP=α时,将线段OB绕点O顺时针旋转60°,得到线段OC,作CH⊥ON于点H.当点P在射线ON上运动时,用等式表示线段OA与CH之间的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/a9df6493-a8d0-4d53-9ca4-4ecc7d1441da.png?resizew=485)
(1)如图1,当∠OAP=45°时,试判断OB与AP的位置关系: ;
(2)如图2,当∠OAP=60°时,OA=2时,求线段OB的长度;
(3)如图3,当∠OAP=α时,将线段OB绕点O顺时针旋转60°,得到线段OC,作CH⊥ON于点H.当点P在射线ON上运动时,用等式表示线段OA与CH之间的数量关系,并证明.
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【推荐1】如图①,在Rt△ABC中,∠BAC = 90°,AB = k·AC,△ADE是由△ABC绕点A逆时针旋转某个角度得到的,BC与DE交于点F,直线BD与EC交于点G
(1)求证:BD = k·EC;
(2)求∠CGD的度数;
(3)若k = 1(如图②),求证:A,F,G三点在同一直线上.
(1)求证:BD = k·EC;
(2)求∠CGD的度数;
(3)若k = 1(如图②),求证:A,F,G三点在同一直线上.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892979567083520/2893520641785856/STEM/ac2ce417-ba40-4043-804f-92121106c091.png?resizew=659)
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【推荐2】如图,在等腰
中,
,分别过点A,C作
,
,使
,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/718c9b48-5681-4d88-be1e-5ac05c636763.png?resizew=159)
(1)求证:
是等腰直角三角形.
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/718c9b48-5681-4d88-be1e-5ac05c636763.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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适中
(0.65)
【推荐1】已知:如图
为
的直径,弦
、
相交于点P,
(2)若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(2)若
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解答题-证明题
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适中
(0.65)
【推荐2】如图,正方形
中,E是
边上一点,连接
,过点B作
于点G,交
于点F.
(1)求证:
;
(2)若正方形
的边长
,点E是
的中点,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(1)求证:
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(2)若正方形
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