如图,在
中,
,
,过点A作
,且
,连接
,E、F分别为
、
的中点,连接
,若
,求证:四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1496042c1d721cffd25053e997a9a97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2021/7/15/2764986255384576/2816985396224000/STEM/292779f9c915439baa85e123b604a6b2.png?resizew=194)
更新时间:2021-09-27 09:14:22
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【推荐1】如图,矩形ABCD中,点E、F分别在边AB、CD上,AE=CF,EF与对角线AC交于点O,且BE=BF,∠BEF=2∠BAC.
(2)求证:△BOF≌△BCF;
(3)若BC=2
,求AB的长.
(2)求证:△BOF≌△BCF;
(3)若BC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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【推荐2】已知,△ABC中,AC=BC,∠ACB=90°,D为AB的中点,若E在直线AC上任意一点,DF⊥DE,交直线BC于F点.G为EF的中点,延长CG交AB于点H.
![](https://img.xkw.com/dksih/QBM/2016/6/21/1574211743170560/1574211748855808/STEM/97ce51edbcba47349f4ce17300b15cd1.png?resizew=242)
(1)若E在边AC上.
①试说明DE=DF;
②试说明CG=GH;
(2)若AE=3,CH=5.求边AC的长.
![](https://img.xkw.com/dksih/QBM/2016/6/21/1574211743170560/1574211748855808/STEM/97ce51edbcba47349f4ce17300b15cd1.png?resizew=242)
(1)若E在边AC上.
①试说明DE=DF;
②试说明CG=GH;
(2)若AE=3,CH=5.求边AC的长.
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【推荐1】如图,点E、F、G、H分别是凹四边形的边CD、BC、AB、DA的中点.
求证:四边形EFGH是平行四边形.
求证:四边形EFGH是平行四边形.
![](https://img.xkw.com/dksih/QBM/2018/10/22/2059104380305408/2059316261552128/STEM/e5198ce63b204f0385cc15af3def0bf3.png?resizew=113)
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【推荐2】如图,E、F分别是矩形ABCD的边BC、AD上的点,且BE=DF.求证:四边形AECF是平行四边形.
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【推荐1】如图1,直线
和直线
相交于A点
,B、C分别在y轴的正半轴和负半轴上,B点坐标为
,C点坐标为
.
的函数表达式;
(2)在线段
上找一点P,使得
,求P点的坐标;
(3)如图2,D点为线段
的中点,若点Q是线段
(不与点A、B重合)上一点,且使得
,请求出Q点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a08ff2ce9077b072721a20489edf1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99cfd8d0ca0221dce6b469ae39134bc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1124fedc54913766487d03da221088c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5efbcec6e539d53a1685a3f373c851be.png)
(3)如图2,D点为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9753ceaeeedb95f89accdf2fafbe5155.png)
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【推荐2】如图,在
中,
是高,
是中线,且
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/3c36691b-f05d-4924-ba9a-35918a26f9ea.png?resizew=143)
(1)求证:
;
(2)若
,
,则
,
的长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a668fcb9a29eebda06220828d3b0877d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/3c36691b-f05d-4924-ba9a-35918a26f9ea.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085cbdd37657b21dd1b686fc02d4f223.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe5383ff62f7047721e61397694588a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c3c112368d374afe3c2f8a4a1ce29c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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