在平行四边形
中,
,M是
的中点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5181b97a7e43959b8455680157c3b644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e533b38aa568366239517885e144bd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/3dc65ab6-7a26-4bec-b9fd-3509347a9a6f.png?resizew=187)
更新时间:2024-03-12 09:01:21
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【推荐1】在正方形网格中,每个小正方形的顶点称为格点,每个小正方形的边长都是1,如图所示,点A,B,O都在格点上,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
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【推荐2】如图,在
与
中,
在
边上,
,
,
,
.
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934a9508c176f44bf58f88715bd98f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f03a43549ab71f0998fffbcb48397b00.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d6a15f4b10b5ae49a674c7e291d795f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
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解答题-作图题
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【推荐1】如图,
中,
,
平分
.
(1)过点A作
的垂线
,H为垂足,
交
于点P;(要求:尺规作图,保留作图痕迹,不写作法)
(2)求证:
.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/09a7ad15-bbe1-4f41-aa47-b9abf7230122.png?resizew=198)
(1)过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd50cf631e459b58b180cdf2f57844c.png)
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【推荐2】如图1,在△ABC中,∠ABC=45°,CD⊥AB,BE⊥AC,垂足分别为点D,E,BE与CD相交于F.
![](https://img.xkw.com/dksih/QBM/2020/12/10/2611410137219072/2614740696432640/STEM/c2d70841-25cb-48be-967e-5a0f4a64ca6d.png)
![](https://img.xkw.com/dksih/QBM/2020/12/10/2611410137219072/2614740696432640/STEM/e4387063-ce0c-4bca-999a-06f4f3a9dfd2.png)
(1)求证:BF=AC;
(2)如图2,H为边BC的中点,连接DH交BE于点G,若BE平分∠ABC,CE=3,求GE的长.
![](https://img.xkw.com/dksih/QBM/2020/12/10/2611410137219072/2614740696432640/STEM/c2d70841-25cb-48be-967e-5a0f4a64ca6d.png)
![](https://img.xkw.com/dksih/QBM/2020/12/10/2611410137219072/2614740696432640/STEM/e4387063-ce0c-4bca-999a-06f4f3a9dfd2.png)
(1)求证:BF=AC;
(2)如图2,H为边BC的中点,连接DH交BE于点G,若BE平分∠ABC,CE=3,求GE的长.
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名校
【推荐3】为了测量学校旗杆的高度,八(1)班的两个数学研究小组设计了不同的方案,请结合下面表格的信息,完成任务问题.
测量旗杆的高度 | ||
测量工具 | 测量角度的仪器、皮尺等 | |
测量小组 | 第一小组 | 第二小组 |
测量方案示意图 | | |
设计方案及测量数据 | 在地面确定点C,并测得旗杆顶端A的仰角,即![]() | 如图1,绳子垂直挂下来时,相比旗杆,测量多出的绳子长度![]() 如图2,绳子斜拉直后至末端点P位置,测量点P到地面的距离 ![]() ![]() ![]() |
任务一 | 判断分析 | 第一小组要测旗杆![]() |
任务二 | 推理计算 | 利用第二小组获得的数据,求旗杆的高度![]() |
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【推荐1】如图,
中,E、F是对角线B、D上两点,若
,请说明
与
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