已知:如图,
与
相交于点O,且
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c35c43d90814396ff06336fa45e9650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ada52a0dae5711ac607f5384b2532a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/ae0e92bc-88fb-48d8-8187-d3d83bd1932e.png?resizew=181)
更新时间:2023-10-13 16:30:56
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
ABCD中,AC=8,BD=12,点E,F在对角线BD上,点E从点B出发,以1 cm/s的速度向点D运动,同时点F从点D出发以相同速度向点B运动,到端点时运动停止,运动时间为t s.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/da9b2e42-8114-4dde-b518-04f2285dee98.png?resizew=270)
(1)BE=____________cm;EF=___________cm(用含有t的代数式表示);
(2)求证:四边形AECF为平行四边形;
(3)求当t为何值时,四边形AECF为矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/da9b2e42-8114-4dde-b518-04f2285dee98.png?resizew=270)
(1)BE=____________cm;EF=___________cm(用含有t的代数式表示);
(2)求证:四边形AECF为平行四边形;
(3)求当t为何值时,四边形AECF为矩形.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在梯形
中,
,
与
交于点O,且
.
;
(2)设
,
,当
时,试用向量
、
表示向量
.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce45423dfd04d1eda929510c46979456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79cbea5ead335c45b6c2974e718f30c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4f8173bb7787b6b107acfe767dd1d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64f1161e0345b3646c71365430dccbb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5f1b06a56fc382feed28e01f1ad102.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】【发现】如图1,在
中,D为
上一点,连结
,在
上取一点E,连结
,若
,
,求证:
.
【应用】如图2,在平行四边形
中,对角线
交于点O,E为
上一点,连结
,
,
,若
,求
的长.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf18a89d2bc8795a4393d02b0f970e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/584ef7fb14f46f78cc64730d18bdf9c3.png)
【应用】如图2,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f88b916bb26432f2584a462eb5aaf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0267d755ce31abd4ff46f5cb0f8a9838.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0125050f12e366a3f549aff58107d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/df03fd0b-f522-467b-aa27-ee0751971741.png?resizew=412)
您最近一年使用:0次