已知:四边形
是平行四边形,点
为
边上一点,且
,求证:
(1)
;
(2)
.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/10/10e830c9-b733-4681-82fb-5038c76ce080.jpg?resizew=149)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09a1fef7051fd91d360b265347e9332a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546f5e3bf6a3b60f85ea730a6cd7b36e.png)
更新时间:2023-07-06 14:44:28
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解答题-证明题
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【推荐1】完成下面的证明:
已知:如图,E是∠CDF平分线上一点,BE
DF交CD于点N,AB
CD.
求证:∠ABE﹦2∠E.
证明:∵BE
DF,
∴∠CNE=∠ ,( )
∠E=∠ ,( )
∵DE平分∠CDF.
∴∠CDF=2∠EDF;
∴∠CNE=2∠E.
又∵AB
CD,
∴∠ABE=∠ ,
∴∠ABE﹦2∠E.
已知:如图,E是∠CDF平分线上一点,BE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
求证:∠ABE﹦2∠E.
证明:∵BE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
∴∠CNE=∠ ,( )
∠E=∠ ,( )
∵DE平分∠CDF.
∴∠CDF=2∠EDF;
∴∠CNE=2∠E.
又∵AB
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
∴∠ABE=∠ ,
∴∠ABE﹦2∠E.
![](https://img.xkw.com/dksih/QBM/2021/7/5/2757789574660096/2779813172494336/STEM/20865fa6-e44e-49db-90dc-a0aba54f1417.png)
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【推荐1】如图,四边形
是平行四边形,E、F是对角线
上的两点,且
,顺次连接B、E、D,F.求证:四边形
是平行四边形.
![](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/d8ce1475f537b4ad21775bfaa16daa0c.png)
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名校
【推荐2】如图,在
中,
,
于E,D为
上一点,且
,
平分
交
于F.求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd502919a1d47941161aeaa336731e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](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/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35803969509655f72b4118503ae1c966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/b13ad87d-1bf0-4a14-9c3c-7fe1dcccd9c7.png?resizew=185)
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【推荐1】如图,在△ABC中,∠C=90°,点P在AC上运动,点D在AB上,PD始终保持与PA相等,BD的垂直平分线交BC于点E,交BD于点F,连接DE.判断DE与DP的位置关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/518f420b-2443-41da-945a-50c2c46938ba.png?resizew=197)
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【推荐2】如图1,
是菱形
的对角线,点
是边
上一点,将
沿着
翻折,点
的对应点
恰好落在
的延长线上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/1f29f20d-b536-4032-a8dc-22d4c108126d.png?resizew=308)
(1)求证:
平分
;
(2)如图2,若点
落在
上.
①猜想
与
之间的数量关系,并证明你的结论;
②若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/1f29f20d-b536-4032-a8dc-22d4c108126d.png?resizew=308)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a2e6494cf8d2dff0746a9bb72cef43.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
①猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d786ee723231d4ca87eb9d011a378b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107aafb813337f2456413a03fe5b6092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bed13973ffe158bced45616efee224b6.png)
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解答题-证明题
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【推荐1】如图,四边形ABCD是平行四边形,E,F是直线AC上的两点,连接BE,DE,BF,DF.给出以下条件:①BE∥DF;②BE=DF;③AE=CF.请你从中选取一个条件,使∠1=∠2成立,并给出证明.
![](https://img.xkw.com/dksih/QBM/2021/5/8/2716709092401152/2782670549450752/STEM/296827bd-d037-4986-b672-ae0aeb573d04.png)
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解答题-证明题
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【推荐2】已知,在平行四边形
中,
为
上一点,且
,连接
交
于点
,过点
作
于
,交
于点
.
![](https://img.xkw.com/dksih/QBM/2019/8/19/2272217390538752/2273053228310528/STEM/5b730c54a0e84e8d87e42ee60629272b.png?resizew=194)
(1)若
,求
的度数;
(2)若
,过点
作
交
于点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://img.xkw.com/dksih/QBM/2019/8/19/2272217390538752/2273053228310528/STEM/5b730c54a0e84e8d87e42ee60629272b.png?resizew=194)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c525f41a646dad2be187e0eb6a9e48fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ee7a7bac7898bb9114c2cec0503064.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf10d92f20501e19d25f6f4159aab89.png)
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