1 . 阅读材料:如图
,在
中,
,
,点
在
边上,
于点
,
于点
,则
.(此结论不必证明,可直接应用)
![](https://img.xkw.com/dksih/QBM/2018/11/13/2074891754233856/2076314789289984/STEM/76938d66005e43fbb1da34e5eeb48d90.png?resizew=339)
【理解与应用】
如图
,正方形
的边长为
,对角线
,
相交于点
,点
在
边上,
于点
,
于点
,则
的值为________.
【类比与推理】
如图
,矩形
的对角线
,
相交于点
,
,
,点
在
边上,
交
于点
,
交
于点
,求
的值;
【拓展与延伸】
如图
,
的半径为
,
,
,
,
是
上的四点,过点
,
的切线
,
相交于点
,点
在弦
上,
交
于点
,
于点
,当
时,
是否为定值?若是,请求出这个定值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a9354a07397b21c33820fc2590e814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/959961b7660d25e917e225e098652c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e294dfd5270b9984a39ea03e654c907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b7c32fc9b7685b68f30c5e12315a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f091b2f73b5026d3e8af14c899793c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a4a36225d67854c6f38b708b7dfa51.png)
![](https://img.xkw.com/dksih/QBM/2018/11/13/2074891754233856/2076314789289984/STEM/76938d66005e43fbb1da34e5eeb48d90.png?resizew=339)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b7c32fc9b7685b68f30c5e12315a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f091b2f73b5026d3e8af14c899793c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9292a1dc93f6a4ac6966d7ce9f9f2b33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d527d4795ece4a5756d1cf8dba31e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337421403f59eb20bdc8b446691f8a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42d0e22c2ca4eb75fceff37689ec61f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751ecadbdb35b894f9308283d804efa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9292a1dc93f6a4ac6966d7ce9f9f2b33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c19892ef06c935935be49a486ede773.png)
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.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/c3407e83df0d037d628061f7a89b6b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935ad59079c158ea0f92018fc548e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d1180ff335ee753be55fd1c1279f41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1037ee0e659d70c1b990b2245bb3cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac935442607d387b60046f1f179b965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9292a1dc93f6a4ac6966d7ce9f9f2b33.png)
您最近一年使用:0次
2018-11-15更新
|
200次组卷
|
7卷引用:【万唯原创】2016年河北省中考数学-面对面-考前猜押下
(已下线)【万唯原创】2016年河北省中考数学-面对面-考前猜押下(已下线)【万唯原创】2015年河北省中考数学-试题研究-第二部分题型4下苏科版九年级数学上册综合检测试卷(全册)(已下线)【万唯原创】2016年份河南省中考数学试题研究-数学正文第二部分解答题题型6(已下线)【万唯原创】2015年河南省中考数学面对面-第二部分题型5(已下线)【万唯原创】2015年山西中考数学-试题研究-第二部分题型2专题4类型3+4(已下线)【万唯原创】2015年山西中考-试题研究-第二部分题型2专题4类型3+4
2 . 如图①所示,在△ABC中,点O是AC上一点,过点O的直线与AB,BC的延长线分别相交于点M,N.
【问题引入】
(1)若点O是AC的中点,
,求
的值;
温馨提示:过点A作MN的平行线交BN的延长线于点G.
【探索研究】
(2)若点O是AC上任意一点(不与A,C重合),求证:
;
【拓展应用】
(3)如图②所示,点P是△ABC内任意一点,射线AP,BP,CP分别交BC,AC,AB于点D,E,F.若
,
,求
的值.
【问题引入】
(1)若点O是AC的中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/694d114391a3d832e8253aa2dee93dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3258d6203680dbd7949beebce44453b.png)
温馨提示:过点A作MN的平行线交BN的延长线于点G.
【探索研究】
(2)若点O是AC上任意一点(不与A,C重合),求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20810abf03ab7826e5af7aa05afcd0d8.png)
【拓展应用】
(3)如图②所示,点P是△ABC内任意一点,射线AP,BP,CP分别交BC,AC,AB于点D,E,F.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae42af16641c73d6a779f4dd793a3d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df505ba13219c11863607b757cbe61a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/970496276d831126182e9403a4f547eb.png)
![](https://img.xkw.com/dksih/QBM/2017/10/11/1799325556523008/1810184972754944/STEM/3b0555fab2a34754958a300c04940fe2.png?resizew=326)
您最近一年使用:0次
2017-11-04更新
|
1447次组卷
|
10卷引用:2018届人教版九年级数学下册(河北专版)检测卷:第二十七章检测卷
2018届人教版九年级数学下册(河北专版)检测卷:第二十七章检测卷2018届人教版九年级数学下册(安徽专版)检测卷:期中检测卷(已下线)决胜2018中考压轴题全揭秘 专题15 相似形问题【区级联考】吉林省长春市南关区2019届九年级上学期期末考试数学试题苏科版2019届九年级下册数学期中测试卷(3)2018届人教版九年级数学下册(通用版)检测卷:第二十七章检测卷安徽省池州市石台县2018-2019学年九年级上学期期末数学试题2020年湖北省武汉市中考数学二模试题2020年湖北省襄阳市保康县中考适应性考试数学试题(已下线)专题20 作平行线和作垂线构造相似三角形的技巧-2023年中考数学二轮复习核心考点专题提优拓展训练
真题
3 . 如图,在△ABC中,D是BC边上的点(不与点B、C重合),连结AD.
问题引入:
(1)如图①,当点D是BC边上的中点时,S△ABD:S△ABC= ;当点D是BC边上任意一点时,S△ABD:S△ABC= (用图中已有线段表示).
探索研究:
(2)如图②,在△ABC中,O点是线段AD上一点(不与点A、D重合),连结BO、CO,试猜想S△BOC与S△ABC之比应该等于图中哪两条线段之比,并说明理由.
拓展应用:
(3)如图③,O是线段AD上一点(不与点A、D重合),连结BO并延长交AC于点F,连结CO并延长交AB于点E,试猜想
的值,并说明理由.
问题引入:
(1)如图①,当点D是BC边上的中点时,S△ABD:S△ABC= ;当点D是BC边上任意一点时,S△ABD:S△ABC= (用图中已有线段表示).
探索研究:
(2)如图②,在△ABC中,O点是线段AD上一点(不与点A、D重合),连结BO、CO,试猜想S△BOC与S△ABC之比应该等于图中哪两条线段之比,并说明理由.
拓展应用:
(3)如图③,O是线段AD上一点(不与点A、D重合),连结BO并延长交AC于点F,连结CO并延长交AB于点E,试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b80634440244a82f3f77ab4c48266a.png)
![](https://img.xkw.com/dksih/QBM/2014/7/31/1573743110291456/1573743116550144/STEM/6a389dea299d44c49351a0f313d651cb.png?resizew=435)
您最近一年使用:0次
2016-12-05更新
|
4651次组卷
|
11卷引用:【万唯原创】2015年河北省中考数学-试题研究-第二部分题型7
(已下线)【万唯原创】2015年河北省中考数学-试题研究-第二部分题型72014年初中毕业升学考试(四川内江卷)数学2015年人教版初中数学九年级下册期中练习卷山东省东营市广饶县乐安中学2017届九年级上学期期中考试数学试题安徽省桐城市黄岗中学2018届九年级上学期第二次月考数学试题2(已下线)【万唯原创】2015年河南省中考数学试题研究专项-数学题型-第一部分题型7 专题2(已下线)【万唯原创】2015年河南省中考数学2014年真题-题型五(已下线)【万唯原创】2018年河南省中考数学红绿蓝-红卷-2018年易错题集训13(已下线)【万唯原创】2018年河南省中考数学红绿蓝-红卷-2018年16K不带密封线专题13(已下线)【万唯原创】与动点有关的探究·满分特训(一)(已下线)(专题)相似三角形的常见辅助线
名校
4 . 在
中,
,
,点
为
边上一动点,且
,
交
边于点
.探究:如图1,若
.
时,求
的长;
(2)当
为等腰三角形时,求
的长;
(3)延伸:如图2,若
,
为
上一点,且
.小东经过研究发现:“当点
在
边上运动时,
的长度不变,是个定值.”你认为小东的结论是否正确?如果正确,请求出这个定值;如果不正确,说明理由;
(4)若
,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c14a66ed4bd66df65bc42c4ac1ed15c.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/983d4402fddd33c1cc85ebc1711d2c0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.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/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8a6ac027fb5985958afa2fe35d3d4e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)延伸:如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc60f2fd9c91293a743111539202a169.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6618b4d41917e695da2356c016242ba4.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7cc5c75476896a599093f5ac10b97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e5d4f93699f8dcffb0e7840ca5597e.png)
您最近一年使用:0次
5 . 如图,
是等边三角形,点D,B,C,E在同一条直线上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/4/e0db9e58-eb4f-4a81-82ef-73685c3272b0.png?resizew=223)
(1)求证:
;
(2)若
,
,求
的长;
(3)探究
,
,
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1b8d111d101afbbf301a2c56c6d15e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/4/e0db9e58-eb4f-4a81-82ef-73685c3272b0.png?resizew=223)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec0af66bc4cdd9b190277015ef57d399.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1772fcf5995e63876fe258e38cfbdb03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
6 . 已知在
中,
,
是
边上的一点,将
沿着过点
的直线折叠,使点
落在
边的点
处(不与点
重合),折痕交
边于点
.
,
是
的中点,求证:
;
【变式求异】如图2,若
,
,
,过点
作
于点
,求
和
的长;
【化归探究】如图3,若
,
,且当
时,存在两次不同的折叠,使点
落在
边上两个不同的位置,请直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d39905e9a31068ede43d213f4bf1c99.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/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.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/29ef747dfdeb036aad26aa9657dc4ecc.png)
【变式求异】如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/254f7a81902cd8fde1073f729c9bb1e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c1e75eb744576c32eed3f9d20f9558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10809d172017faa4b3bf06c8a61a5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
【化归探究】如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0435918d2827c71ad44635af8d0d480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d00be47dcb89793f14a2fd10f4c522b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5228da61bed106b28849ef91a2ec116.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
名校
解题方法
7 . 如图
至图
,
中,
,
,点
在折线
上,连接
,将
沿
向右上方折叠,折叠后得到
或四边形
.
探究如图
,若
,点
在
上
①当射线
经过点
时,求证:
;
②当点
,
的距离最小时,求
的长.
尝试如图
,若
,点
在
上,当点F在
的延长线上时,求
的值.
延伸如图
,若
,
,
恰好经过点
时,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2176dac04a8b410e319342fb8e895b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7e5389296a5226b31c66f711c3e2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963731fbdd29638642f58d81309541dc.png)
探究如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
①当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77115cc84ffa9d03e314d49971a4de46.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
尝试如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2130fe380f9042c2fb31e1343cd41d88.png)
延伸如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ee7149bd58649b5c8b84439e118e53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca5f6366db8d915043332f818b65d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次
8 . 如图1,在正方形
中,E,F分别在边
上,且
于点
.
与
的数量关系为______;
(2)数学小组的同学在此基础上进行了深入的探究:
①如图2,在正方形
中,若点E,F,G,H分别在边
上,且
于点
,求证:
;
②如图3,将①中的条件“在正方形
中”改为“在矩形
中,
,
”,其他条件不变,试推理线段
与
的数量关系;
③如图4,在四边形
中,
,
,
,点
为
的三等分点,连接
,过点
作
,垂足为点
,直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4515e1dff9a852b3294dc1d6488a5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783b84ed8d927b77491092f7d2ee2989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)数学小组的同学在此基础上进行了深入的探究:
①如图2,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f758a811b8a2c260431aa7e6a4060987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846b1b49f05812b0761eb565062d32f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9016de3d17a389fb5d0952f616c19e0c.png)
②如图3,将①中的条件“在正方形
![](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/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04730ed5e8918d21339c2df7924667e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
③如图4,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08fbe1ffda48379e678fa89bb5a7c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4be3a3ed5f6bd2ec1363a13595741903.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
您最近一年使用:0次
9 . 嘉淇做数学探究实验,如图,已知:
,
为直角三角形,其中
,
,
,
,现以
为边作四边形
,且
,
,
.
第一步,如图1,将
的顶点
与点
重合,
在
上;
第二步,如图2,将
绕点O逆时针方向旋转,每秒旋转
,
,
分别与
边交于点M,N;
第三步,如图3,当
旋转到点P落在
上时停止旋转,此时点Q恰好在
上;
第四步,如图4,在第三步的基础上,点O带动
立即沿边
从点A向点E平移,每秒
个单位长度,当点O与点E重合时停止运动.
设整个过程中
的运动时间为
秒.
(1)如图1中,①求证
;②求AE的长
(2)如图2,嘉淇发现
的值为定值k,请求出k的值;
(3)如图3,当
从初始位置到点P落在CD上时,求PD的长度;
(4)当点P落在四边形
的边上时,直接 写出对应的t值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20439884b3089382a6e9c9fa01a9151d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2e679d7b314ff58c284da08e8edbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2236dbbf9bd5ac99fdaf700eded3ca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637331a6bcf269d7d3487ee4cfb536f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/518e0f9afe701015dce4b359705c59f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df34369163e511f14028168cb0b21186.png)
第一步,如图1,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
第二步,如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
第三步,如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
第四步,如图4,在第三步的基础上,点O带动
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
设整个过程中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/80a64e13-7f14-444f-8547-e7a8ad284241.png?resizew=764)
(1)如图1中,①求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a6697494d524edcc58110d5849e009.png)
(2)如图2,嘉淇发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bb76395c08f97f42bf2e28a03674211.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
(4)当点P落在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
您最近一年使用:0次
名校
10 . 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/2023/12/4/bdf65203-54d8-4d1e-a683-07ce4bc52f3d.png?resizew=460)
(1)在图1的基础上,将正方形
绕着点
沿顺时针方向旋转,如图2所示,求证:
且
.
(2)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.
(3)在(2)的条件下,若
,
,矩形
在顺时针旋转过程中,当点
,
,
在同一直线时,请直接写出
的值.
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/4/bdf65203-54d8-4d1e-a683-07ce4bc52f3d.png?resizew=460)
(1)在图1的基础上,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc180eda08edfb6d54eb04da7741f099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a987dd51f99d58c731c596c78dcd7e.png)
(2)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/cc1d36437d9e50f560536853ecd636d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a873a58367976340775a3c0bdd702370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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