综合与实践
在一次综合实践课上,老师让同学们尝试着将发的矩形纸片
进行折纸探究:
如图,在矩形
中,
,点E是边
上的一个点,老师提出:折叠时折痕必须过点E.
(1)“希望”小组提出:如图①,若
,将矩形
沿直线
翻折,点D恰好落在
上的点
处.求
的长;
(2)“思维”小组受“希望”小组的启发提出:如图②,将矩形
沿
折叠,点B,点C的对应点分别是点P,点F,延长
交边
于点G,
交边
于点H.请判断四边形
是什么特殊四边形?并加以证明;
(3)“缜密”小组提出:在(2)的基础上,若取(1)中
的值,设
,直接写出x的取值范围是______________.
在一次综合实践课上,老师让同学们尝试着将发的矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
如图,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f5e900da706536c57f7c1ae7a1174a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)“希望”小组提出:如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafe62061fc6fc21ca3f3f1ee18c23ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4171e7f713d6b265d56b2662b7af57b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac8dd1ba94e8fb0add305e610e78a7be.png)
(2)“思维”小组受“希望”小组的启发提出:如图②,将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5af9d87a48c40c0c6ce6da03906b671.png)
(3)“缜密”小组提出:在(2)的基础上,若取(1)中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c07a967e8eb319e6466ab8eb47f3630.png)
![](https://img.xkw.com/dksih/QBM/2020/12/1/2605048159354880/2606435618586624/STEM/51d46d5b004845969cd75a402e1e2e32.png?resizew=260)
2018九年级·山西·专题练习 查看更多[1]
(已下线)【万唯原创】2018年山西-预测卷-预测卷六
更新时间:2020-12-03 21:49:45
|
【知识点】 根据正方形的性质与判定求线段长
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在
中,A
,
平分
,四边形
是平行四边形,
交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/f737290c-3415-4d77-ad59-2c6a7b7b2da8.png?resizew=204)
(1)求证:四边形
是矩形.
(2)若
,
,求矩形
对角线的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbafb55c798cf0d0bf34604adc887312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/f737290c-3415-4d77-ad59-2c6a7b7b2da8.png?resizew=204)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adfe2a58326612fcabd34fd4402a66ee.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a4f539d2bfd695b69b0446e01f5265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adfe2a58326612fcabd34fd4402a66ee.png)
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解答题-问答题
|
适中
(0.65)
名校
【推荐2】
在平面直角坐标系中的位置如图所示,
与
轴交于点
,点
的坐标为
,线段
,
的长分别是方程
的两根,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/8be130c5-0d67-4881-b46b-5184746de811.png?resizew=254)
(1)求线段
的长;
(2)动点
从点
出发,以每秒1个单位长度的速度沿
轴负半轴向终点
运动,过点
作直线
与
轴垂直,设点
运动的时间为
秒,直线
扫过四边形
的面积为
,求
与
的关系式;
(3)
为直线
上一点,在平面内是否存在点
,使以
,
,
,
为顶点的四边形为正方形?若存在,请直接写出点N的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fcf82d01c39fd2c96e1edba0ad37dd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7e88b74f492f89e21e4cf65353bdb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/841efb8acc17c0c921e888aed94ff19e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d707c621dfb4e9e5c371e730689fcf4b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/8be130c5-0d67-4881-b46b-5184746de811.png?resizew=254)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f7c674f87a67fde99afceb3cfd8189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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