如图,正方形
中,E是
上的一点,连接
,过B点作
,垂足为点H,延长
交
于点F,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/eca0ca8e-5396-4a40-a55a-55b0a02ed4b9.png?resizew=122)
(1)求证:
.
(2)若正方形边长是5,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5486478d317b66a6830138d6e87f752.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/eca0ca8e-5396-4a40-a55a-55b0a02ed4b9.png?resizew=122)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9327d1c2faee1d33db246ab52e43e4f9.png)
(2)若正方形边长是5,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
更新时间:2023-04-01 23:28:20
|
相似题推荐
解答题-问答题
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适中
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【推荐1】如图1,在
中,求作菱形
,使其面积等于
的面积的一半,且点E,F,G,H分别在边
,
,
,
上.
(1)小明所作的四边形
是菱形吗?为什么?
(2)四边形
的面积等于
的面积的一半吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
小明的作法 ①如图2,连接 ![]() ![]() ②过点O作直线 ![]() ![]() ![]() ③过点O作l的垂线,分别交 ![]() ![]() ④连接 ![]() ![]() |
(1)小明所作的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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解题方法
【推荐2】已知在等腰△ABC中,AB=AC,在射线CA上截取线段CE,在射线AB上截取线段BD,连接DE,DE所在直线交直线BC与点M.请探究:
(1)如图(1),当点E在线段AC上,点D在AB延长线上时,若BD=CE,请判断线段MD和线段ME的数量关系,并证明你的结论.
(2)如图(2),当点E在CA的延长线上,点D在AB的延长线上时,若BD=CE,则(1)中的结论还成立吗?如果成立,请证明;如果不成立,说明理由;
(3)如图(3),当点E在CA的延长线上,点D在线段AB上(点D不与A,B重合),DE所在直线与直线BC交于点M,若CE=2BD,请直接写出线段MD与线段ME的数量关系.
(1)如图(1),当点E在线段AC上,点D在AB延长线上时,若BD=CE,请判断线段MD和线段ME的数量关系,并证明你的结论.
(2)如图(2),当点E在CA的延长线上,点D在AB的延长线上时,若BD=CE,则(1)中的结论还成立吗?如果成立,请证明;如果不成立,说明理由;
(3)如图(3),当点E在CA的延长线上,点D在线段AB上(点D不与A,B重合),DE所在直线与直线BC交于点M,若CE=2BD,请直接写出线段MD与线段ME的数量关系.
![](https://img.xkw.com/dksih/QBM/2015/4/13/1578635732639744/1578635733139456/STEM/a31444a8-f705-4ac1-857f-0f68c30a0f03.png?resizew=422)
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解答题-计算题
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【推荐1】下面是课河某初中数学小组探究用不同方法计算三角形面积的片段,请仔细阅读并完成任务.
任务:
(1)按照嘉嘉的思路,我们还有______种作辅助线求解的方法;
(2)请根据嘉嘉或者琪琪的思路求出三角形
面积;(用一种方法即可)
(3)
的两条角平分线
,
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到边
的距离.
试题:在三角形![]() ![]() ![]() ![]() ![]() 嘉嘉:过点 ![]() ![]() ![]() ![]() ![]() ![]() ![]() 琪琪:教材中提到了海伦一秦九韶公式:如果一个三角形的三边长分别为 ![]() ![]() ![]() ![]() ![]() |
(1)按照嘉嘉的思路,我们还有______种作辅助线求解的方法;
(2)请根据嘉嘉或者琪琪的思路求出三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/30bdbc86-78f9-4e4d-8b8a-59758212aed8.png?resizew=240)
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【推荐2】如图,
内接于
,
,
的延长线交
于点
.
平分
;
(2)若
,
,求
和
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a2ccf448d0d8499a85092655a37309.png)
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【推荐1】问题情境
在综合实践课上,老师组织兴趣小组开展数学活动,探究正方形的旋转问题.在正方形
和正方形
中,点
在一条直线上,连接
(如图1).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/224ec652-904c-475c-a121-5a5ec4a74b29.png?resizew=294)
(1)图1中线段
和
的数量关系是_____________,位置关系是_____________.
(2)在图1的基础上,将正方形
绕着点A沿顺时针方向旋转,如图2所示,(1)中的结论是否成立?请仅就图2的情况说明理由.
类比探究
(3)如图3,若将图2中的正方形
和正方形
都变为矩形,且
,请仅就图3的情况探究
与
之间的数量关系.
在综合实践课上,老师组织兴趣小组开展数学活动,探究正方形的旋转问题.在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4771cf8b462433f40782f296acec103a.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/224ec652-904c-475c-a121-5a5ec4a74b29.png?resizew=294)
(1)图1中线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)在图1的基础上,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
类比探究
(3)如图3,若将图2中的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87c0b1634be4f7bf7b112c113d8c8c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
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解答题-证明题
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【推荐2】如图,四边形
、
是以
的边
、
为边向
外所作的正方形.
求证:(1)
.(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4342db34ee8c281fc39235f80a069bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b23b0bf953a5a322becc1fee82ba6bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b77bc18585582cd9aac6bf8daecec48.png)
![](https://img.xkw.com/dksih/QBM/2017/10/29/1812036259799040/1831282772688896/STEM/c1b8f8b7-f3b6-49a8-a5ba-d0f6efed7186.png?resizew=272)
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