如图,在正方形
中,O是
的中点,E是
上一点,连接
,交
于点H,作
于点
于点G,连接
.
;
(2)求证:
.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80125e48498ac9c548732e2af1b1758d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbbe17be59b45e135b45c40553ff9827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f28d5f302d6614b5c74031c4d22120d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700e070b4b5661c68eec66f9e561da76.png)
更新时间:2024-05-08 12:42:03
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相似题推荐
解答题-证明题
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名校
解题方法
【推荐1】四边形ABCD是正方形,AC是对角线,E是平面内一点,且
,过点C作
,且
.连接AE、AF,M是AF的中点,作射线DM交AE于点N.
(1)如图1,若点E,F分别在BC,CD边上.
求证:①
;
②
;
(2)如图2,若点E在四边形ABCD内,点F在直线BC的上方,求
与
的和的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9896780c93626546ca64459a964f48d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d87e7b8560fbc34b448beb0da46a6c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21204d1c00149a21f59c004f6b927237.png)
(1)如图1,若点E,F分别在BC,CD边上.
求证:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef202bebb4e139f5e201d6adefdded4b.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e1876839631d0df8e87dbafc8bdb42a.png)
(2)如图2,若点E在四边形ABCD内,点F在直线BC的上方,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6344778ed1e75c1a99e2268468081867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfc6f50c441d803f3b5ab60acc15a30d.png)
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【推荐2】如图1,在
中,
,点
是线段
上的一点(不与
,
重合)以
为一边在
的右侧画
,使
,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/89d02a1f-9c1d-4983-8ad1-6d307788f084.png?resizew=471)
(1)求证:
.
(2)设
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49dca0cc635668c549ec80c1d893ed4.png)
①如图2,当点
在射线
上,且在线段
外,
和
有什么数量关系?请说明理由
②如图3,当点
在射线
上,且在线段
外,①中结论是否成立?若不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43651721f6c0ea4cf50a33054ecc5d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/89d02a1f-9c1d-4983-8ad1-6d307788f084.png?resizew=471)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc71a2c3f2159da7847f4c6350ad4a53.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49dca0cc635668c549ec80c1d893ed4.png)
①如图2,当点
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
②如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐1】如图,在△ABC 中,∠BAC=90°,AB=AC,D 是 AC 边上一动点, CE⊥BD 于 E.
(1)如图(1),若 BD 平分∠ABC 时,①求∠ECD 的度数;②求证:BD=2EC;
(2)如图(2),过点 A 作 AF⊥BE 于点 F,猜想线段 BE,CE,AF 之间的数量关系并证明你的猜想.
(1)如图(1),若 BD 平分∠ABC 时,①求∠ECD 的度数;②求证:BD=2EC;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/653684d5-0012-4811-90f4-4acd16b4e81a.png?resizew=411)
(2)如图(2),过点 A 作 AF⊥BE 于点 F,猜想线段 BE,CE,AF 之间的数量关系并证明你的猜想.
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【推荐2】如图,在菱形ABCD中,AB=4,∠BAD=120°,以点A为顶点的一个60°的角∠EAF绕点A旋转,∠EAF的两边分别交BC,CD于点E,F,且E,F不与B,C,D重合,连接EF.
(1)求证:BE=CF.
![](https://img.xkw.com/dksih/QBM/2018/1/10/1857334722076672/1860947563880448/STEM/3c4396765d4243fc86e67ce74d3f2a8f.png?resizew=246)
(2)在∠EAF绕点A旋转的过程中,四边形 AECF的面积是否发生变化?如果不变,求出其定值;如果变化,请说明理由.
(1)求证:BE=CF.
![](https://img.xkw.com/dksih/QBM/2018/1/10/1857334722076672/1860947563880448/STEM/3c4396765d4243fc86e67ce74d3f2a8f.png?resizew=246)
(2)在∠EAF绕点A旋转的过程中,四边形 AECF的面积是否发生变化?如果不变,求出其定值;如果变化,请说明理由.
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解答题-问答题
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【推荐1】已知△ABC三条边的长分别为a、b、c.
(1)若
,当△ABC为等腰三角形,求△ABC的周长;
(2)若(1)中所得的a、b是Rt△ABC的两条边长,求第三边长c的值.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1179b2b15ca1f38ca29eec0916cb59f3.png)
(2)若(1)中所得的a、b是Rt△ABC的两条边长,求第三边长c的值.
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【推荐2】如图是俱乐部新打造的一款儿童游戏项目,工作人员告诉小敏,该项目
段和
段均由不锈钢管材打造,总长度为26米,矩形
和矩形
均为木质平台的横截面,点G在
上,点C在
上,点D在
上,经过现场测量得知
米,
米.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/02e6a22e-4232-40c8-b0ca-5a1126763417.png?resizew=216)
(1)求立柱
的长度;
(2)为加强游戏安全性,俱乐部打算再焊接一段钢索
,经测量
米,请你求出要焊接的钢索
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99bc9e301f78a1af74825fbab9766e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec07464a1b5bc7a2cc338b1a13e0f4a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44cbab64c34b6317ee4c68ba7f8d56c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/02e6a22e-4232-40c8-b0ca-5a1126763417.png?resizew=216)
(1)求立柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)为加强游戏安全性,俱乐部打算再焊接一段钢索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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【推荐1】如图,正方形
的边长为6,根据图中的作图痕迹,若
,请连接
并求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/6/12105252-1f0f-4289-a08f-cef2aa9f34e3.png?resizew=130)
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【推荐2】如下,在正方形
和正方形
中,点
在
上,
,
是
的中点,
与
交于点
,连接
.
;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e1d23582960af08cfb018cb12b2443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9ab76553aba5fa3afae1ed0d251d1a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
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