已知在平行四边形
中,点
在
边上,连接
.
(1)如图1,求证:
;
(2)如图2,过点
作
于点
,交
于点
,求证:
;
(3)如图3,在(2)的条件下,若
为
的中点,
,平行四边形
的面积为36,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f544863e1ecd99227f11114c0620de62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/23/652031fc-01ae-428d-8b4a-45535b832936.png?resizew=451)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee8395bbad7eb776f328d816b5abbb7.png)
(2)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eb5de7ac3b81d4bb5d79708f65034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09beb9a3e8f7a8eaeba831228ac3e8bf.png)
(3)如图3,在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6cd8d8014369d969c0fdaefc53a446c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
更新时间:2023-08-19 22:02:00
|
相似题推荐
解答题-作图题
|
困难
(0.15)
【推荐1】如图1,直线
与
轴、
轴分别交于
、
两点,点
在线段
上从
向
运动,另一动点
从
出发,沿直线
运动,记
的长为
,
的坐标为
,分析此图后,对下列问题作出探究:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/927c4a80-3134-409d-999b-54e0c3c2e21a.png?resizew=566)
(1)
________,
________;
(2)当
且
时,
;
(3)如图2,当
垂直时,
①猜想线段
和
的数量关系,并证明你得到的结论;
②求出
关于
的函数关系式,并写出自变量
的取值范围;
③直接写出当
为等腰三角形时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec89d17a1b8f7961e2f1f27c2d50685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604346851022cdaa16f0c16cc03ef695.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/927c4a80-3134-409d-999b-54e0c3c2e21a.png?resizew=566)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a548e8a2e2205f2faa87e25180a083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a836d2dfc31d2bfc949bac8403cf2a4e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759f39be289d60cdb4de0677ab425211.png)
(3)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7737522e76ac74ead6b90a8e09b6da5.png)
①猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
②求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
③直接写出当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐2】已知正方形
,
,
为平面内两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/66011072-2878-4edb-9d06-2ff101ed5b2d.png?resizew=436)
(1)【探究建模】如图1,当点
在边
上时,
,且
,
,
三点共线.求证:
;
(2)【类比应用】如图2,当点
在正方形
外部时,
,
,且
,
,
三点共线.猜想并证明线段
,
,
之间的数量关系;
(3)【拓展迁移】如图3,当点
在正方形
外部时,
,
,
,且
,
,
三点共线,
与
交于
点.若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/66011072-2878-4edb-9d06-2ff101ed5b2d.png?resizew=436)
(1)【探究建模】如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efffb3e6a571832b723b3c5795b8e8c.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
(2)【类比应用】如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efffb3e6a571832b723b3c5795b8e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce726bceb02452bb4e5ed6b00fa94e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)【拓展迁移】如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeeee5f39ee6f9c3ea01ada75d63b93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d6b9ccc3a025e4f11717cfd7ab354b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5322a78b02c2bc387ea7dce3e9461974.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ade06068471a9d76e32b417bef7551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐1】已知:
都是锐角
的高.
;
(2)如图2,延长
至F,使
,连接
,过点C作
于点G,在
上取点M,使
,连接
,求证:
;
(3)如图3,在(2)的条件下,过点A作
于点N,若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0da1f94cd38666cf340b690960b14193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ee0c16f9f19a34635e6209cae1fa1d.png)
(2)如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df9327f2d81d6eb1f92f582f5d82a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7471451108cf5d0fbb66e8819759a6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab1f21901e4735a178589a9c1978743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/609b2dbc67be40c19e59bd28b4d8c3fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fff73edff653a42ff070f94f0bd08b1e.png)
(3)如图3,在(2)的条件下,过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0344f66232633fd5aebf8da384b4b381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cef054efca753a07be1fefe5fa768ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be27c9bfc639e19ea6ec0c8d330d9098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】如图,⊙O的弦AC与BD互相垂直于点E,OA交ED于点F.
![](https://img.xkw.com/dksih/QBM/2022/3/20/2940148335075328/2957951358402560/STEM/9e4f4264-13e8-4d60-9626-952259f49fb4.png?resizew=562)
(1)如图(1),求证:∠BAC=∠OAD;
(2)如图(2),当AC=CD时,求证:AB=BF;
(3)如图(3),在(2)的条件下,点P,Q在CD上,点P为CQ中点,∠POQ=∠OFD,DF=EC,DQ=6,求AB的长.
![](https://img.xkw.com/dksih/QBM/2022/3/20/2940148335075328/2957951358402560/STEM/9e4f4264-13e8-4d60-9626-952259f49fb4.png?resizew=562)
(1)如图(1),求证:∠BAC=∠OAD;
(2)如图(2),当AC=CD时,求证:AB=BF;
(3)如图(3),在(2)的条件下,点P,Q在CD上,点P为CQ中点,∠POQ=∠OFD,DF=EC,DQ=6,求AB的长.
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
解题方法
【推荐1】如图,已知抛物线y=
x2+
x﹣4与x轴交于A、B两点(点A在点B的左侧),与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/2020/5/26/2470781222371328/2471584540557312/STEM/4a798b91761a454c90b282647a604fb6.png?resizew=323)
(1)连接BC,P是线段BC上方抛物线上的一动点,过点P作PH⊥BC于点H,当PH长度最大时,在△APB内部有一点M,连接AM、BM、PM,求AM+
BM+PM的最小值.
(2)若点D是OC的中点,将抛物线y=
x2+
x﹣4沿射线AD方向平移
个单位得到新抛物线y′,C′是抛物线y′上与C对应的点,抛物线y'的对称轴上有一动点N,在平面直角坐标系中是否存在一点S,使得C′、N、B、S为顶点的四边形是矩形?若存在,请直接写出点S的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f30d314a642667fef559032264647366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbb86e88765213f7b00d9962d56941e.png)
![](https://img.xkw.com/dksih/QBM/2020/5/26/2470781222371328/2471584540557312/STEM/4a798b91761a454c90b282647a604fb6.png?resizew=323)
(1)连接BC,P是线段BC上方抛物线上的一动点,过点P作PH⊥BC于点H,当PH长度最大时,在△APB内部有一点M,连接AM、BM、PM,求AM+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)若点D是OC的中点,将抛物线y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f30d314a642667fef559032264647366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbb86e88765213f7b00d9962d56941e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】如图1,矩形
中,
,
,点E,F分别为
,
边上任意一点,现将
沿直线
对折,点A对应点为点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/06a4e567-5a57-4669-809c-5a051b16ce22.png?resizew=205)
(1)若点B与点F重合
①如图2,若
,当点P落在
中垂线上时,求
的长;
②当点P可以两次落在
中垂线上时,求a取值范围;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/ca9415ef-42f6-4c18-b987-1dd8434315de.png?resizew=200)
(2)如图3,连接
,若
,直线
交
的边于点G,是否存在点G,使得以E,G,P为顶点的三角形与
相似.若存在,请求出
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/06a4e567-5a57-4669-809c-5a051b16ce22.png?resizew=205)
(1)若点B与点F重合
①如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②当点P可以两次落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/ca9415ef-42f6-4c18-b987-1dd8434315de.png?resizew=200)
(2)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12549a6cdf22d9bf9f60bf827a61a7be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/ccbdac63-40d4-4534-937b-7987db4be90a.png?resizew=218)
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解答题-证明题
|
困难
(0.15)
【推荐1】如图所示,在
中,
,垂足为
,
平分
,点
为
的中点,点
为
上的一点,连接
、
、
、
,
.
(1)若
,
,求
和
的长.
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.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/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.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/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98b6981e0b9882b0e4e3e27c14caf55.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca779608eb35d380b27c6da16f1a211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f089a93876391b3bfd211502a236feb9.png)
![](https://img.xkw.com/dksih/QBM/2020/3/4/2412285104128000/2412377743343616/STEM/6f96b38f9fb84fd78e7efa6d48e4c6c9.png?resizew=276)
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解答题-证明题
|
困难
(0.15)
【推荐2】定义:有一组邻边相等的凸四边形叫做“准菱形”,利用该定义完成以下各题:
(1)理解:如图1,在四边形ABCD中,若__________(填一种情况),则四边形ABCD是“准菱形”;
(2)应用:证明:对角线相等且互相平分的“准菱形”是正方形;(请画出图形,写出已知,求证并证明)
(3)拓展:如图2,在Rt△ABC中,∠ABC=90°,AB=2,BC=1,将Rt△ABC沿∠ABC的平分线BP方向平移得到△DEF,连接AD,BF,若平移后的四边形ABFD是“准菱形”,求线段BE的长.
(1)理解:如图1,在四边形ABCD中,若__________(填一种情况),则四边形ABCD是“准菱形”;
(2)应用:证明:对角线相等且互相平分的“准菱形”是正方形;(请画出图形,写出已知,求证并证明)
(3)拓展:如图2,在Rt△ABC中,∠ABC=90°,AB=2,BC=1,将Rt△ABC沿∠ABC的平分线BP方向平移得到△DEF,连接AD,BF,若平移后的四边形ABFD是“准菱形”,求线段BE的长.
![](https://img.xkw.com/dksih/QBM/2018/4/11/1921685056405504/1922446954536960/STEM/03876141-2cd0-439d-b33f-194811775e48.png?resizew=701)
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