题型:解答题-证明题
难度:0.65
引用次数:4524
题号:6239969
如图,在
中,
于点E,延长BC至F点使
,连接AF,DE,DF.
(2)若
,
,
,求AE的长.
![](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/42d4546153ab4353af86c0023f2c2092.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb388a36bd5caaa51b7e3c898e3c906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a2a325fa8c7507ac0b688d8e44b732.png)
更新时间:2018-04-02 15:27:49
|
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适中
(0.65)
【推荐1】如图有一块三角尺,
,
,
,
,用一张面积最小的正方形纸片将这个三角尺完全覆盖,求出这个正方形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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解答题-证明题
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名校
【推荐2】如图,已知
,分别以
为边,在
外侧作等边
和等边
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/628fc1e3-e2de-479c-bc2f-51b629e47726.png?resizew=171)
(1)求证:
.
(2)当
时,求证:
.
(3)当
,
时,求
与
的面积和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d251bf48e719fabb5bbce4b0f737475a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79281384668b7f5f850b2372eda320b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/628fc1e3-e2de-479c-bc2f-51b629e47726.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5adc18ca424552b35ab939e9d57943e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2aabb3232e9ffabad9def25515cbdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5114f84337c12fe132a216dbce31791a.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐1】图,在
中,
,点
是
的中点,连接
,点
是
的中点,延长
至
,使
,连接
、
,
与
交于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/d8dd0803-d9fb-49c7-adf0-9a591e3bff7b.png?resizew=233)
(1)求证:四边形
是矩形;
(2)若
,
,
,求三角形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cbd1d4bdcf1199ec44f9ba5348ac42.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/d8dd0803-d9fb-49c7-adf0-9a591e3bff7b.png?resizew=233)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a5a2949b3d520ed03d57126c7d4d8d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5824ce5fa38678123d258a8e72c6bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b56cdfda704536954359b9a682e72b5c.png)
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解答题-证明题
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适中
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【推荐2】如图,在▱ABCD,点O是边BC的中点,连接DO并延长,交AB的延长线于点E,连接BD、EC.
(1)求证:四边形BECD是平行四边形;
(2)若∠BOD=100°,则当∠A= 时,四边形BECD是矩形.
(1)求证:四边形BECD是平行四边形;
(2)若∠BOD=100°,则当∠A= 时,四边形BECD是矩形.
![](https://img.xkw.com/dksih/QBM/2019/5/12/2202279085785088/2209183022891008/STEM/445ed6075c3f4e058121d00e6184cba7.png?resizew=168)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】利用矩形的性质,证明“直角三角形斜边上的中线等于斜边的一半”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/44d78733-f882-4ed4-9367-597c97a253ae.png?resizew=80)
已知:如图, ;
求证: ;
证明:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/44d78733-f882-4ed4-9367-597c97a253ae.png?resizew=80)
已知:如图, ;
求证: ;
证明:
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解答题-问答题
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适中
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【推荐2】如图所示的是处于工作状态的某型号手臂机器人示意图,
是垂直于工作台的移动基座,
为机械臂,
,
,
,
,
,
,
,
.(点A,B,C,D,E,F,O在同一平面内)
______度,
______度.
(2)求机械臂端点C到工作台的距离
的长.(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4515e1dff9a852b3294dc1d6488a5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c86bb958b654915a420e0f203226897e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a754f490a46f1664c3b1b8bcc73c217a.png)
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(2)求机械臂端点C到工作台的距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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