在①
;②
;③
这三个条件中选择其中一个,补充在下面的问题中,并完成问题的解答
问题:如图,在
中,点D是
的中点,点E、F分别是线段
及其延长线上的点,且
,若 ,(填序号)证明四边形
是菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fb90434b6da93bdc6590f769ef118b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6208c5d00b6d1b07968917deb859c1d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
问题:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49404e6b19a342401a80d9feb1144605.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/8/b0fa831c-a025-4e2d-a77a-6ad6e9dd93b8.png?resizew=186)
更新时间:2023-05-03 09:24:26
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在四边形
中,
,点O是
的中点,且
.
![](https://img.xkw.com/dksih/QBM/2021/6/24/2749968428548096/2750042184753152/STEM/c7cc04d5e960473bbc7a993efea25e37.png?resizew=191)
(1)求证:四边形
是菱形;
(2)过点C作
交
的延长线于点E,连接
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68d31600cba2d5256c7e78b6122d6755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://img.xkw.com/dksih/QBM/2021/6/24/2749968428548096/2750042184753152/STEM/c7cc04d5e960473bbc7a993efea25e37.png?resizew=191)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d036ee24f0b010e82c53cbc1704f86b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
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【推荐2】已知:如图,在等边△ABC中,点O是BC的中点,∠DOE=120°,∠DOE绕着点O旋转,角的两边与AB相交于点D,与AC相交于点E.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893537560485888/2932644687642624/STEM/84c59e80-3b2f-475a-964a-9274e7625f19.png?resizew=354)
(1)若OD,OE都在BC的上方,如图1,求证:OD=OE.
(2)在图1中,BD,CE与BC的数量关系是 .
(3)若点D在AB的延长线上,点E在线段AC上,如图2,直接写出BD,CE与BC的数量关系是 .
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893537560485888/2932644687642624/STEM/84c59e80-3b2f-475a-964a-9274e7625f19.png?resizew=354)
(1)若OD,OE都在BC的上方,如图1,求证:OD=OE.
(2)在图1中,BD,CE与BC的数量关系是 .
(3)若点D在AB的延长线上,点E在线段AC上,如图2,直接写出BD,CE与BC的数量关系是 .
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解答题-证明题
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适中
(0.65)
【推荐1】已知,如图,在
中,
,垂足为
是
外角
的平分线,
,垂足为
,连接
交
于
.
的形状,并证明你的结论.
(2)线段
与
有怎样的关系?请写出并证明你的结论.
(3)当
满足什么条件时,四边形
是一个正方形?简述你的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3c86ef20d87c3c94c0ba6b5addd1095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80fdc69d4cde3af7de56de2c0933cb3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bab53e0cb6e6ec13764e326b98f26b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab1578665918e9bc35fbefc92feb90c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
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名校
【推荐2】已知
是等边三角形,点
是
的中点,点
在射线
上,点
在射线
上.
.
(1)如图1,若点
与
点重合,求证:
;
(2)如图2,若点
在线段
上,点
在线段
上,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c14bbec030c04ca347c6a1e34e536e4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/7e380da7-0dbb-415a-90c3-33d72cdc343d.png?resizew=343)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74c235458fef37aff6fcb66e3da8ae62.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68382ff66094cacf36aa3ee978dd6930.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在四边形
中,
,
,
的平分线
,
分别与线段
交于点
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/32eee1ea-b4e1-4297-8b89-8de19f62092b.png?resizew=212)
(1)求证:四边形
为平行四边形;
(2)当
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/32eee1ea-b4e1-4297-8b89-8de19f62092b.png?resizew=212)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解题方法
【推荐2】如图所示,
中,
,延长
到
,使
,点
是
的中点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f74a61581d965458316280968241e4c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936c74c9a7edc81c037f4ea795d130bd.png)
![](https://img.xkw.com/dksih/QBM/2019/6/10/2222632656207872/2222873368641536/STEM/eea22f9e5b614957ad5e152b9dcb179d.png?resizew=150)
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【推荐1】已知:如图,在
中,点
分别在
上,
平分
.请从以下三个条件:①
;②
;③
中,选择一个合适的条件,使四边形
为菱形.
(1)你添加的条件是_______(填序号);
(2)添加了条件后,请证明四边形
为菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11944f055fd806016ae3576019d4bf30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d163ba9cef35eb600387bcfbbda89ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333ab24c4935210f4c232cd0c0fae358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/577ce170-cbbe-4e93-b6d9-81bd93663096.png?resizew=222)
(1)你添加的条件是_______(填序号);
(2)添加了条件后,请证明四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
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【推荐2】如图,平行四边形ABCD中,G是CD的中点,E是边AD上的动点,EG的延长线与BC的延长线交于点F,连结CE,DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/6187d3c9-eea7-44fb-8bcb-da9bf6895e6b.png?resizew=154)
(1)求证:四边形CEDF为平行四边形;
(2)若AB=6cm,BC=10cm,∠B=60°,
①当AE= cm时,四边形CEDF是矩形;
②当AE= cm时,四边形CEDF是菱形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/6187d3c9-eea7-44fb-8bcb-da9bf6895e6b.png?resizew=154)
(1)求证:四边形CEDF为平行四边形;
(2)若AB=6cm,BC=10cm,∠B=60°,
①当AE= cm时,四边形CEDF是矩形;
②当AE= cm时,四边形CEDF是菱形.
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