数学老师在课上呈现一个几何图形,如图,∠1=∠2,AB⊥CD于点E,过点E作一条直线分别交线段BC,AD于点F,G.同学们根据图形进行大胆猜想.小方说:当∠3=∠1=50°时,可求得∠CFE的度数.小何说:当BF=CF时,可证得EG⊥AD.
(1)依据小方说的条件,你求得∠CFE= .(直接写出答案)
(2)依据小何说的条件,请你判断他的结论是否正确,并说明理由.
(1)依据小方说的条件,你求得∠CFE= .(直接写出答案)
(2)依据小何说的条件,请你判断他的结论是否正确,并说明理由.
![](https://img.xkw.com/dksih/QBM/2021/12/19/2875636560732160/2877182165983232/STEM/9efd61387bfd458a9159b3800c0a92a3.png?resizew=197)
更新时间:2021-12-21 10:25:00
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】某客轮在点C处失事后,在其附近有A、B两处专业救助点,B在A的正东方向,且相距100海里,海上搜救中心在获知客轮C失事后,测得出事地点C在A的南偏东60°方向,在B的南偏东30°方向,若救助轮航行速度是25海里/小时,试问A处救助轮赶到出事地点C需要多长时间?(结果保留根号)
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896313845923840/2973802846633984/STEM/27a6ca4b-8642-48ad-a9b6-c148e45690e7.png?resizew=191)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】在
中,
,点
、
、
分别是
、
、
上的点,且
,
.
(1)求证:
.
(2)若
,则
______°.
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a6a050763dc557c76bfc1cb0dc2347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e17b9ede029417de1cc7dc094093d16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/e60332c1-55e7-4ee9-b7f6-5e5154cdc857.png?resizew=140)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef7d6922ae315d08f6a2013dda2f227b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2658bd98bc22b4ae72fb6ad8f7babfca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2a8bf5e05a07c93a7104839fc21849.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】下面是小明同学的作业及自主探究笔记,请认真阅读并补充完整.
【作业】如图①,在
中,
,
,点
为线段
上一动点(不与端点
,
重合),以
为边在
的上方作正方形
,连接
,求证:
.
证明:
,
,
.
四边形
是正方形,
,
.
,
,
________.
又
,
,
________,
.
,
.
【探究】
(1)如图②,当点
在线段
的延长线上时,其他条件同上.请判断
、
和
三条线段之间的关系,并说明理由.
(2)如图③,当点
在线段
的反向延长线上时,且点A,
分别在直线
的两侧,其他条件同上,在正方形
中,对角线
、
相交于点
,若
,
,直接写出
的长.
【作业】如图①,在
![](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/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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf0fa55b2728fbe1ddf8d3b33b07043.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/fe6268c9-f2a6-4b06-ad3e-f21c9118e942.png?resizew=166)
图①
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3ca7645614c362363ce66f6811ebad1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64fc9ccb4e9eb351b6ce1c3697a19d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595d7d9e3cf0f62e1d8167926abfd209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597221bdc3fdacf0b653e447330df351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bdb4ec1fb92d009bca16d378104716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a407583c48a4358f0a9892db1212c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0da552dbed4bbb91fc8d66d06ed0ef8a.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fb9bc6163bd3f8aa1a8b0a70c9cbf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4e363bfd418579e6229230df034bbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4009febdcbb2600e558dc4bfdd950cec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2465905e3e20be86a6a993a511ef57a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7839a3658382d7f9b35f8fa4f017892b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffbf247d393f0d6c642a15eee20c927.png)
【探究】
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/48200962-83b8-4021-9ea7-52b24e1144b8.png?resizew=163)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/c0eb637a-8053-4bb7-a59a-431c2a3fcc34.png?resizew=158)
图② 图③
(1)如图②,当点
![](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/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图③,当点
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6bdfb0e1be5583e794ab614a8abe1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知:如图,在平面直角坐标系
中,
的一边
在
轴上,
,点
在第一象限,
,
,反比例函数的图象经过
的中点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/325d2def-93cb-41fc-9e2f-f3a68319164b.png?resizew=194)
(1)求直线
的解析式和线段
的长;
(2)若该反比例函数的图象与
的另一边
交于点
,求反比例函数的解析式和线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993649d2e9fcff7f42124cdd99f0fb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef520a2657abdf14fa6818c380b596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49437f474e5805688dff21ded2d1fd7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/325d2def-93cb-41fc-9e2f-f3a68319164b.png?resizew=194)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)若该反比例函数的图象与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993649d2e9fcff7f42124cdd99f0fb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次