如图在
中,点
是
延长线上的点,过
、
、
三点作
分别交
于点
,交
于点
,直径![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d33367290ac86e10c2200df76f294b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/67fa3d8d-b333-4201-8d8b-6fd9eb85ad52.png?resizew=183)
(1)证明:
平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31123a003f9c8be58e0d78399e43c14a.png)
(2)若
,
,求
的长度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54efc4116b6cb296d55892a21e0d797f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d33367290ac86e10c2200df76f294b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/67fa3d8d-b333-4201-8d8b-6fd9eb85ad52.png?resizew=183)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31123a003f9c8be58e0d78399e43c14a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c253dff5777118b5ccc0adb342cfcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/081e8339d9c02ae1fd602804cd3ab2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
更新时间:2022-12-15 10:43:23
|
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解答题-证明题
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适中
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名校
【推荐1】在平行四边形ABCD中,E,F分别是AB,DC上的点,且AE=CF,连接DE,BF,AF.
(1)求证:四边形DEBF是平行四边形;
(2)若AF平分∠DAB,AE=3,DE=4,BE=5,求AF的长.
(1)求证:四边形DEBF是平行四边形;
(2)若AF平分∠DAB,AE=3,DE=4,BE=5,求AF的长.
您最近一年使用:0次
解答题-问答题
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适中
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【推荐2】如图所示,在
中,
,
,
,
为
的中点,点
在线段
上由点
出发向点
运动,同时点
在线段
上由点
出发向点
运动,设运动时间为
.
与点
的速度都是
,则经过多长时间
与
全等?请说明理由.
(2)若点
的速度比点
的速度慢
,则经过多长时间
与
全等?请求出此时两点的速度.
(3)若点
、点
分别以(2)中的速度同时从点
,
出发,都按逆时针方向沿
三边运动,则经过多长时间点
与点
第一次相遇?相遇点在
的哪条边上?请求出相遇点到点B的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c5a41c17b487a678bb1dcdd390d0db0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb4853c9f383c2f9956ba6d672c1c45.png)
(2)若点
![](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/f4e5acdedbab4bba6a4f5defc72c70b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983add910c8e09954f164a5e87d1f7fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb4853c9f383c2f9956ba6d672c1c45.png)
(3)若点
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,▱ABCD的对角线AC、BD相交于点O.你能在图中找出几对全等的三角形?证明你的结论.
![](https://img.xkw.com/dksih/QBM/2020/5/6/2457141503705088/2458270098817024/STEM/a5be409c5e79459182b5083c6588820f.png?resizew=165)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】如图,平行四边形ABCD中,对角线AC与BD相交于点O,AG⊥BD于G,CH⊥BD于H.
![](https://img.xkw.com/dksih/QBM/2020/10/15/2571287489011712/2573174794403840/STEM/75924c1318ca45358b769b6d776784cb.png?resizew=213)
(1)求证:OG=OH;
(2)若∠BAC=90°,∠AOD=120°,请直接写出图中所有长度是OG长度2倍的线段.
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(1)求证:OG=OH;
(2)若∠BAC=90°,∠AOD=120°,请直接写出图中所有长度是OG长度2倍的线段.
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解答题-证明题
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适中
(0.65)
【推荐1】如图,AB是O的直径,AC是弦,且OD⊥AC于点E,OD交⊙O于点F,连接CF、BF,若∠BFC=∠ODA.
(2)若AB=10,AC=8,求AD的长.
(2)若AB=10,AC=8,求AD的长.
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解答题-作图题
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适中
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【推荐2】在方格纸中,仅用无刻度直尺过点A画出圆的所有切线.
(1)如图1,点A在圆上;
(2)如图2,点A在圆外.
(1)如图1,点A在圆上;
(2)如图2,点A在圆外.
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882817933131776/2883744736854016/STEM/bc2d275d-3a70-44e3-befd-c1ab5070fab3.png?resizew=546)
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