名校
1 . 综合与实践课上,老师让同学们以“正方形的折叠”为主题开展数学活动.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/58209157-c5ce-47e2-a0d0-5707bc737be9.png?resizew=427)
(1)操作判断
操作:如图1,点E是边长为12的正方形纸片
的边所在的射线
上一动点,将正方形沿着
折叠,点D落在点F处,把纸片展平,射线DF交射线
于点P.
判断:根据以上操作,图1中
与
的数量关系:______.
(2)迁移探究
在(1)条件下,若点E是
的中点,如图2,延长
交
于点Q,点Q的位置是否确定?如果确定,求出线段
的长度,如果不确定,说明理由;
(3)拓展应用
在(1)条件下,如图3,
,
交于点G,取
的中点H,连接
,求
的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/58209157-c5ce-47e2-a0d0-5707bc737be9.png?resizew=427)
(1)操作判断
操作:如图1,点E是边长为12的正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
判断:根据以上操作,图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)迁移探究
在(1)条件下,若点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
(3)拓展应用
在(1)条件下,如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
您最近一年使用:0次
2023-10-18更新
|
119次组卷
|
6卷引用:2023年河南省驻马店市学业水平考试九年级数学试题
名校
2 . 解答
(1)问题发现:如图1,在
和
中,
,
,点
是线段
上一动点,连接
.填空:
①
的值为______ ;
②
的度数为______ .
(2)类比探究:如图2,在
和
中,
,
,点
是线段
上一动点,连接
.请判断
的值及
的度数,并说明理由;
(3)拓展延伸:如图3,在(2)的条件下,将点
改为直线
上一动点,其余条件不变,取线段
的中点
,连接
、
,若
,则当
是直角三角形时,线段
的长是多少?请直接写出答案.
(1)问题发现:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a356ae65ad2cccdd27189efcea2da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4907f159ff9c4caacf266db591588.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
(2)类比探究:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17df03e1b7418a84e8f8a3d512b2c1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4907f159ff9c4caacf266db591588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
(3)拓展延伸:如图3,在(2)的条件下,将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8045b729b7f257861057191a8a2388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
2023-05-09更新
|
194次组卷
|
21卷引用:2020年山东省东营市东营区九年级6月学业模拟考试数学试题
2020年山东省东营市东营区九年级6月学业模拟考试数学试题吉林省市命题七十七2019-2020学年九年级上学期期中数学试题2020年河南省中考模拟数学试题(一)(已下线)专题冲刺小卷12 几何综合问题-2020年《三步冲刺中考·数学》之最新模考分类冲刺小卷(河南专用)2020年山东省东营市东营区中考数学6月模拟试题2020年山东省广饶县初中学业水平模拟考试数学试题河南省周口市太康县2020-2021学年九年级上学期期末数学试题2021年河南郑州外国语中学原创押题卷(B卷) 数学试题(已下线)【万唯原创】2021年河南试题研究-练习册-第四章 三角形5河南省郑州市外国语中学2019-2020学年九年级上学期第二次月考数学试题2022年山东省菏泽市牡丹区中考二模数学试题河南省新乡市卫辉市2021-2022学年九年级上学期期末数学试题福建省三明市永安市2022~2023学年九年级上学期期中考试卷河南省郑州市金水区经纬中学2021-2022学年九年级下学期开学数学试卷(一模) 安徽省亳州市2022--2023学年九年级上学期期末数学试卷山东省东营市东营区文华学校2022-2023学年九年级上学期期末数学试题(已下线)2023年河南省洛阳市偃师市中考数学一模试题变式题21-23题2023年山东省东营市垦利区中考二模数学试题江西省抚州市八校2023-2024学年九年级上学期第一次月考数学试题江苏省宿迁市沭阳县怀文中学、人民路中学2023-2024学年九年级上学期1月期末数学试题2024年山东省泰安市岱岳区中考三模数学试题
3 . 探究归纳题:
(1)试验分析:
如图1,经过一个顶点(如点
)可以作___________条对角线,它把四边形
分为___________个三角形;
(2)拓展延伸:
运用(1)的分析方法,可得:图2过一个顶点作所有的对角线,把这个多边形分为___________个三角形;图3过一个顶点作所有的对角线,把这个多边形分为___________个三角形;
(3)探索归纳:对于
边形
,过一个顶点的所有对角线把这个
边形分为___________个三角形.(用含
的式子表示)
(4)特例验证:过一个顶点的所有对角线可把十边形分为___________个三角形.
(1)试验分析:
如图1,经过一个顶点(如点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)拓展延伸:
运用(1)的分析方法,可得:图2过一个顶点作所有的对角线,把这个多边形分为___________个三角形;图3过一个顶点作所有的对角线,把这个多边形分为___________个三角形;
(3)探索归纳:对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629017d4178d2b98bbc882901bef023e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(4)特例验证:过一个顶点的所有对角线可把十边形分为___________个三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/509dfa2a-4942-4b67-8b38-ae4426d33d1e.png?resizew=372)
您最近一年使用:0次
2022-12-14更新
|
275次组卷
|
6卷引用:广东省佛山市南海区九江镇联考2022-2023学年七年级上学期学科调查数学试卷
广东省佛山市南海区九江镇联考2022-2023学年七年级上学期学科调查数学试卷(已下线)专题7.23 多边形的内角和与外角和(知识讲解)-2022-2023学年七年级数学下册基础知识专项讲练(苏科版)(已下线)专题4.1 多边形(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(浙教版)(已下线)专题19.1 多边形内角和(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(沪科版)(已下线)专题4.1 多边形(知识要点+专项练习)-2022-2023学年八年级数学下册同步精品课堂(浙教版)(已下线)专题6.13 多边形的内角和与外角和(知识讲解)-2022-2023学年八年级数学下册基础知识专项讲练(北师大版)
4 . (1)如图1,在等边
中,M是BC上的任意一点(不含端点B、C),连接AM,以AM为边向右作等边
,连接CN.求证:
.
![](https://img.xkw.com/dksih/QBM/2021/3/12/2676306282913792/2677167833268224/STEM/959c5089-83c4-4c6a-8d7c-b57a3bbad761.png)
【类比探究】
(2)如图2,在等边
中,M是BC延长线上的任意一点(不含端点C),其他条件不变,(1)中结论
还成立吗?请说明理由.
【拓展延伸】
(3)如图3,在等腰
中,
,
,连接AM,以AM为边向右作等腰
,使顶角
,连接CN,请直接写出CN与AC之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdc9f4a99b567a6ee4be3943beeddca.png)
![](https://img.xkw.com/dksih/QBM/2021/3/12/2676306282913792/2677167833268224/STEM/959c5089-83c4-4c6a-8d7c-b57a3bbad761.png)
【类比探究】
(2)如图2,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdc9f4a99b567a6ee4be3943beeddca.png)
【拓展延伸】
(3)如图3,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5e7f01745e79b9f613398bb274b6d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/881f92487ba6848994dc3c7756665dd2.png)
您最近一年使用:0次
2021-03-13更新
|
282次组卷
|
4卷引用:河南省安阳市安阳县2020-2021学年九年级下学期适应性测试(会考)数学试题
河南省安阳市安阳县2020-2021学年九年级下学期适应性测试(会考)数学试题2021年河南省安阳市安阳县中考数学适应性试题(已下线)专题15 几何探究题-备战2022年中考数学母题题源解密(河南专用)华东师大版九年级上册第23章图形的相似单元测试数学试题
5 . “综合与实践”是以问题为中心,以活动为平台,以解决某一实际的数学问题为目标,综合应用知识和方法解决问题,它是对数学知识的延伸和发展,是对理解、运用数学基础知识和基本技能的升华过程.请同学们运用你所学的数学知识来研究和解决以下问题吧.
(1)探究:已知
是平面上一个运动的点,若
,
,则当点
位于 时,线段
的长最小,最小值为 ;若
,
,则当点
位于 时,线段
的长最小,最小值为 ;
(2)应用:已知
是一运动的点,
,
,如图①所示,分别以
为边作等腰直角三角形
和等腰直角三角形
,且
,连接
和
.
①在图中找出与
相等的线段,并说明理由;
②何时线段
可以取得最小值?请直接写出线段
的最小值;
(3)拓展:如图②,在矩形
中,
,
,
为矩形
对角线的交点,
为
边上任意一点,连接
并延长与
边交于点
,现将图中
与
分别沿
与
翻折,使点
与点
分别落在矩形
内的点
,
处,连接
,则
的长有最小值吗?若有,请直接写出
的长的最小值;若没有,请说明理由.
(1)探究:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3015db5ca1f49bb7bad43657e06863ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(2)应用:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51253b21bafa0cf5a374242e65be6864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①在图中找出与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②何时线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)拓展:如图②,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.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/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8414369aceaa4231d66c698380926b14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://img.xkw.com/dksih/QBM/2020/5/9/2458882623610880/2459770084130816/STEM/654207dd2a61453a9e8b6adf57ccbd0f.png?resizew=486)
您最近一年使用:0次
名校
6 . 正方形
中,对角线AC,BD相交于点
、点
为直线
上一点、连接
、绕点
将射线
逆时针旋转
交直线
于点
.
问题提出:(1)如图1.当点
在线段
上时,线段
与
的数量关系为 ,线段BE,BF,BD之间的数量关系为 .
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501629281615872/2503416461615104/STEM/29954441-0396-481e-9a2d-fd8275d58eb0.png)
深入探究:(2)如图2,当点
在
延长线上时,(1)的结论是否成立?请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501629281615872/2503416461615104/STEM/e5c54d94-f847-476f-accb-ece85ae5e4de.png)
拓展延伸:(3)当
时,连接
,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0468237bbc0d3df77435d98b817c10c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
问题提出:(1)如图1.当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501629281615872/2503416461615104/STEM/29954441-0396-481e-9a2d-fd8275d58eb0.png)
深入探究:(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501629281615872/2503416461615104/STEM/e5c54d94-f847-476f-accb-ece85ae5e4de.png)
拓展延伸:(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1332cc5f6471fc13d03caa7ae90d25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501629281615872/2503416461615104/STEM/c6e57c35-f00e-4904-b976-21d71871483b.png)
您最近一年使用:0次
2020-07-11更新
|
634次组卷
|
2卷引用:2020年河南省九年级第三次学业水平测试数学试题(A)
7 . 如图1,将三角板放在正方形
上,使三角板的直角顶点
与正方形
的顶点
重合,三角板的一边交
于点
.另一边交
的延长线于点
.
(1)观察猜想:线段
与线段
的数量关系是_____;
(2)探究证明:如图2,移动三角板,使顶点
始终在正方形
的对角线
上,其他条件不变,(1)中的结论是否仍然成立?若成立,请给予证明:若不成立.请说明理由:
(3)拓展延伸:如图3,将(2)中的“正方形
”改为“矩形
”,且使三角板的一边经过点
,其他条件不变,若
、
,请探究线段
与线段
之间存在怎样的数量关系?(用含
、
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(1)观察猜想:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
(2)探究证明:如图2,移动三角板,使顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)拓展延伸:如图3,将(2)中的“正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a88b719166fcc1431f876bc8c5656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/d33e0a41-8250-4a6e-8e79-593d8b92ec77.png?resizew=466)
您最近一年使用:0次
2020-06-15更新
|
310次组卷
|
10卷引用:2020年四川省乐山市犍为县九年级毕业会考模拟数学试题
2020年四川省乐山市犍为县九年级毕业会考模拟数学试题2020年河南省许昌长葛市九年级第一次模拟数学试题河南省许昌市长葛市2019-2020学年九年级上学期期末数学试题2020年河南省许昌市长葛市中考数学一模试题江苏省沭阳县怀文中学2019-2020学年九年级第8次形成性测试数学试题河南省洛阳市涧西区东升二中2019-2020学年九年级(下)第一次大练习数学试题(已下线)专题19特殊平行四边形-备战2021年中考数学考点 核心考点清单(江苏专用)2023年宁夏石嘴山市平罗县第六中学中考一模数学试题(已下线)广东卷05-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷(广东专用)山西省晋中市榆社县2023-2024学年九年级上学期期中数学试题
8 . 如图1所示,在正方形ABCD和正方形
中,
,连结
.
(1)问题发现:
_________;
(2)拓展探究:将正方形
绕点A逆时针旋转,记旋转角为
,连结
,试判断:当
≤![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
时,
的值有无变化?请仅就图2中的情形给出你的证明;
(3)问题解决:请直接写出在旋转过程中,当
三点共线时
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/c661c22f-f79c-4f9f-be8a-cc586a493a0e.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/6ce68577-6e49-467f-9885-08c879c7d327.png?resizew=138)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b9b6b4ba690f5d170ab3a0a9980636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f6cc09683c5d276993208e82f028f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e748663b134c6161ad31b4a279440cf.png)
(1)问题发现:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b270d15b437535c92921e733ebeeb62.png)
(2)拓展探究:将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b9b6b4ba690f5d170ab3a0a9980636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f022b18f3b30bccee515df5e47ff00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5f3d86127a638b960ee3f4390e0bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b858b1647c5c868fafdbf39df8f3b4b.png)
(3)问题解决:请直接写出在旋转过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/887a4dd02e1bc86cfe7f3eb586623ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f022b18f3b30bccee515df5e47ff00.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/c661c22f-f79c-4f9f-be8a-cc586a493a0e.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/6ce68577-6e49-467f-9885-08c879c7d327.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/1680d38a-1567-46d7-92e3-4d3d7f6c8d51.png?resizew=136)
您最近一年使用:0次
9 . (1)读读做做:教材中有这样的问题,观察下面的式子,探索它们的规律,
=1-
,
=
,
=
……用正整数n表示这个规律是______;
(2)问题解决:一容器装有1L水,按照如下要求把水倒出:第一次倒出
L水,第二次倒出的水量是
L水的
,第三次倒出的水量是
L水的
,第四次倒出的水量是
L水的
,……,第n次倒出的水量是
L水的
,……,按照这种倒水方式,这1L水能否倒完?
(3)拓展探究:①解方程:
+
+
+
=
;
②化简:
+
+
…+
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9ebad3f6e9392c75adb1b8171a5553.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c042434d1b4514a2c8c0b3002772aaa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c16d242ca97a7d0be85162d9414bbb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f6f553e9d6491e4fa6045f3560ad32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877b98ffe21bbbce4e7b153d26625670.png)
(2)问题解决:一容器装有1L水,按照如下要求把水倒出:第一次倒出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10402e4ddd0d323cc1ae83801ae976db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10402e4ddd0d323cc1ae83801ae976db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e4c30981fd0794c8b8f2c21b7af6b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b01bb96aa6159cca61075b1a5999f868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8847d2220fb4244a1feacef28c7cc477.png)
(3)拓展探究:①解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8055dc7496ca2719df87ee6806137abd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5ccf134dc01e496bdb7e3121d72e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c65bb9792c3e4ac18cf737782f3485e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8d0b97a288cfdc31b663b714bc8ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47291547c0cf6af15c6b38d7cb93df8e.png)
②化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb477b49435d9da368a3d837898b93f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f345e7c3a1d754d078e8576f8203a96e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6593df69cb37e2bae44b0dd5f7227767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56013c9421dc7ff20db338c145616ea8.png)
您最近一年使用:0次
2020-03-08更新
|
203次组卷
|
4卷引用:江苏省常州市教育学会2018-2019学年八年级6月学业水平检测数学试题
江苏省常州市教育学会2018-2019学年八年级6月学业水平检测数学试题江苏省常州市2018-2019学年八年级下学期期末数学试题(已下线)专题15.18 分式方程(分层练习)(基础练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(人教版)(已下线)专题5.14 分式与分式方程(全章分层练习)(基础练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(北师大版)
名校
10 . 如图1,在
中,∠B=90°,
,点D,E分别是边BC,AC的中点,连接
将
绕点C按顺时针方向旋转,记旋转角为
.
问题发现:
当
时,
_____;
当
时,
_____.
拓展探究:
试判断:当
时,
的大小有无变化?请仅就图2的情况给出证明.
问题解决:
当
旋转至A、D、E三点共线时,直接写出线段BD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4457aacb176adef9b80531504abc44a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06acd04006658941055e60e7d34ded72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25fe68a3f4ef8f2e36c7af9a848cb155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f802946930ef6cfbcb1a9f033a9092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1486450f300f451e711d2238eaca1a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/21/0dca8cc9-e46a-45f3-b4a9-cac173d15661.png?resizew=591)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7e8c4e8015bc1a44a89460e1dc0d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e85ff0230f5ff1ca98728041de9ce18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd284be60584dfae454b1a125468947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31bc7772d4866e42e5d8c601dc08894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
试判断:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcfbe55f659e4b597bb81680b20db4c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a564371003df29c5f9f327d3c5629521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f802946930ef6cfbcb1a9f033a9092.png)
您最近一年使用:0次
2020-04-11更新
|
535次组卷
|
8卷引用:2020年内蒙古包头市九年级升学考试数学试题