已知
和
均为等腰三角形,
,
,
,点
、
分别为
、
的中点,连接
、
、
、
.
【猜想】如图①,当点
在
上时,线段
和
的大小关系是______;
【探究】如图②,把
绕着点
旋转一定的角度时,线段
和
的大小关系是什么?说明理由;
【拓展】如图③,
和
均为直角三角形,
,且
,
,
,点
、
分别为
、
的中点,连接
、
,当
时,
的面积是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630d82ae0ed6deb825514e0bc92e74a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b50be8b332dca3466980ce3e1973ca4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
【猜想】如图①,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
【探究】如图②,把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
【拓展】如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3103e3bff07e2634b00b41cfb46997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb074e82e07a7f325ebf0e9a000c003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/c4aece1d-767d-4f6c-a883-76223f802458.png?resizew=341)
更新时间:2024-01-12 09:54:59
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】在
中,
,
,点O为
的中点,点D在直线
上(不与点A,B重合),连接
,线段
绕点C逆时针旋转90°,得到线段
,过点B作直线
,过点E作
,垂足为点F,直线
交直线
于点G.
(1)如图1,当点D与点O重合时,连接
,若
,则
.
(2)如图2,当点D在线段
上时,探究线段
,
与
之间的数量关系,并证明;
(3)连接
,
的面积记为
,
的面积记为
,当
时,求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513dca3b8c31bc8d0ed4301e94cc1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d848ed4b868461ad4ff43ebd6f290f95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348844ed42a10010a5c813722cf755bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
(1)如图1,当点D与点O重合时,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/66894e54-81e0-4d44-a544-4bd63c0a1794.png?resizew=160)
(2)如图2,当点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11667abcb2759f301391b9850352be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/e1b9e0d9-5f64-405c-b6cd-2778542e5ab9.png?resizew=161)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01f6f70b5cb3fd3b580e9f298588d6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851cbaf3db25aea4f25bfeab7bfe3876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/79de4c3a-52be-4a8a-8b85-71eea856cb09.png?resizew=162)
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【推荐2】(1)如图1,等腰Rt△ABC中,∠ACB=90°,CB=CA,直线ED经过点C,过点A作AD⊥ED于点D,过点B作BE⊥ED于点E,求证:△BEC≌△CDA.
应用图1的数学模型解决下列问题:
(2)如图2,已知直线l1:y=
x+3与x轴交于点A,与y轴交于点B,将直线l1绕点A逆时针旋转45°至直线l2;求直线l2的函数表达式;
(3)如图3,平面直角坐标系内有一点B(3,﹣4),过点B作BA⊥x轴于点A、BC⊥轴于点C,点P是线段AB上的动点,点D是直线y=﹣2x+1上的动点且在第四象限内.若△CPD为等腰直角三角形,请直接写出点D的坐标.
应用图1的数学模型解决下列问题:
(2)如图2,已知直线l1:y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(3)如图3,平面直角坐标系内有一点B(3,﹣4),过点B作BA⊥x轴于点A、BC⊥轴于点C,点P是线段AB上的动点,点D是直线y=﹣2x+1上的动点且在第四象限内.若△CPD为等腰直角三角形,请直接写出点D的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/4e43fc11-f5da-4362-bd0e-e6ed77ab5ead.png?resizew=536)
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【推荐1】如图,
是
斜边
上的高,延长
至点E,连接
,过点C作
,垂足为F,分别交
、
于点M、N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/3dfe0230-6977-4122-bb2d-f12b1a967d8f.png?resizew=131)
(1)若
,求证:①
平分
;②
.
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80125e48498ac9c548732e2af1b1758d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/3dfe0230-6977-4122-bb2d-f12b1a967d8f.png?resizew=131)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765917637583d22a579ff075f9baa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b2f9dadcab4e616a6753ce7f0b6e10.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28c65312db84bbe37e0e1b400bf78c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba4a7d87c3aecc7e7de4519c0cd186c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐2】(1)如图1,
为边长为2的等边三角形,D是
边上一点且
平分
的面积,则线段
的长度为 ;
(2)如图2,在平行四边形
中,
,
,
,点M在
上,且
,点N在
上,若
平分四边形
的面积,则
的长度为 ;
(3)如图3,凸四边形ABCD为某空地的示意图,经测量
,
米,
米,
米,点E在AB边上满足
.为了美化环境,现规划在空地内种植花卉,并从点D修一条笔直的观光小路
(点F在
上),请问是否存在
,使得
平分该空地的面积?若存在,请求出
的长度;若不存在,请说明理由.(小路DF的宽度不计).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图2,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b947acc328f9561e1d7b78f9bbed9263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)如图3,凸四边形ABCD为某空地的示意图,经测量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33ef3a78a5dce27873cae3e49a60715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2abfd667648d08c47021450699e547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b6867fc617b3293be99e7e4b063782.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f323c8692dacd1fc256f0c5b5447c9fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/5556f9cf-e888-46f0-930b-871a5b101e4e.png?resizew=540)
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【推荐3】如图,点A(a,0)、B(0,b),且a、b满足(a﹣2)2+|2b﹣4|=0.
(2)如图2,若P为AB的中点,点M,N分别是OA,OB边上的动点,点M从顶点A出发向O运动,点N从顶点O向点B运动,且他们的速度都是1个单位长度/秒,在点M和点N的运动过程中,探究线段PM和PN之间的位置和数量关系;
(3)若P为线段AB上异于A、B的任意一点,过点B作BF垂直于直线OP于点F,并延长交x轴于点D,E为x轴上一点,且∠PEA=∠BDO(BD与PE不平行).
①如图3,F在线段OP上,求证:OD=AE;
②设OD=x,DE=y,请直接写出y与x的数量关系式.
(2)如图2,若P为AB的中点,点M,N分别是OA,OB边上的动点,点M从顶点A出发向O运动,点N从顶点O向点B运动,且他们的速度都是1个单位长度/秒,在点M和点N的运动过程中,探究线段PM和PN之间的位置和数量关系;
(3)若P为线段AB上异于A、B的任意一点,过点B作BF垂直于直线OP于点F,并延长交x轴于点D,E为x轴上一点,且∠PEA=∠BDO(BD与PE不平行).
①如图3,F在线段OP上,求证:OD=AE;
②设OD=x,DE=y,请直接写出y与x的数量关系式.
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【推荐1】如图,一次函数
的图象与反比例函数
的图象交于点
两点,与
轴交于点C(1,0),若
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/2275b2f2-7095-4294-922e-c5f9eeadbfdf.png?resizew=188)
(1)求反比例函数与一次函数的表达式;
(2)根据图象直接写出不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e136e7637543c8ae92c8dcd55b31924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0b612460326448de36e160c8d29af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4474a2abc0e638b50e82de1c76ad02c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e47194c8f5359ea1fabcd2ef5febf175.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/2275b2f2-7095-4294-922e-c5f9eeadbfdf.png?resizew=188)
(1)求反比例函数与一次函数的表达式;
(2)根据图象直接写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a36f049ef76c1515098ed2eb685721.png)
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【推荐2】如图1,四边形
是正方形,
是
边上的一个动点(点
与
不重合),以
为一边在正方形
外作正方形
,连接
,
.我们探究下列图中线段
、线段
的长度关系及所在直线的位置关系:
)猜想如图
中线段
,线段
的数量关系是______ ;线段
,
的位置关系____
类比探究:
(
)将图
中的正方形
绕着点
按顺时针(或逆时针)方向旋转任意角度
,得到如图
,如图
情形,请你判断(
)
中得到的结论是否仍然成立,并选取图
证明你的判断;
拓展应用:
(
)已知
,
,在正方形
绕点
旋转的过程中,当点
在同一条直线上时,
的长度是多少?请直接写出答案
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa69fd8445d01c98634c2e885b47d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](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/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
类比探究:
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
拓展应用:
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd665ffb2f62cf6b4d035546e3ab8f7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】(本题满分14分)如图,在正方形ABCD中,AB=5.点E为BC边上一点(不与点B重合),点F为CD边上一点,线段AE、BF相交于点O,其中AE=BF.
![](https://img.xkw.com/dksih/QBM/2017/7/9/1726520972607488/1729401663938560/STEM/3fa9644ed473456fa230c1b504f16537.png?resizew=149)
(1)求证:AE⊥BF;
(2)若OA-OB=1,求OA的长及四边形OECF的面积;
(3)连接OD,若△AOD是以AD为腰的等腰三角形,求AE的长.
![](https://img.xkw.com/dksih/QBM/2017/7/9/1726520972607488/1729401663938560/STEM/3fa9644ed473456fa230c1b504f16537.png?resizew=149)
(1)求证:AE⊥BF;
(2)若OA-OB=1,求OA的长及四边形OECF的面积;
(3)连接OD,若△AOD是以AD为腰的等腰三角形,求AE的长.
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,在
中,AB=AC,E是线段BC上一动点(不与B、C重合),连接AE,将线段AE绕点A逆时针旋转与
相等的角度,得到线段AF,连接
.点
和点
分别是边
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/7c58833d-17da-4a69-9182-fb6f8b868ea7.png?resizew=444)
(1)【问题发现】如图1,若
,当点E是
边的中点时,
____,直线
与
相交所成的锐角 的度数为______度.
(2)【解决问题】如图2,若
,当点E是
边上任意一点时(不与B、C重合),上述两个结论是否成立?若成立,请写出证明过程;若不成立,请说明理由.
(3)【拓展探究】如图3,若
,AB=6,
,在E点运动的过程中,直接写出GN的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/7c58833d-17da-4a69-9182-fb6f8b868ea7.png?resizew=444)
(1)【问题发现】如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3cf42a8dc862fbb78d6a780c420b24a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a3464e90637e0fe75461c44096e746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)【解决问题】如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3cf42a8dc862fbb78d6a780c420b24a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)【拓展探究】如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49938ca6628df6a0e2f71434802990b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/336cf2082c1f8d6a97ca630c9e5b45f1.png)
您最近一年使用:0次