真题
名校
1 . (1)问题发现
如图1,在△OAB和△OCD中,OA=OB,OC=OD,∠AOB=∠COD=40°,连接AC,BD交于点M.填空:
①
的值为 ;
②∠AMB的度数为 .
(2)类比探究
如图2,在△OAB和△OCD中,∠AOB=∠COD=90°,∠OAB=∠OCD=30°,连接AC交BD的延长线于点M.请判断
的值及∠AMB的度数,并说明理由;
(3)拓展延伸
在(2)的条件下,将△OCD绕点O在平面内旋转,AC,BD所在直线交于点M,若OD=1,OB=
,请直接写出当点C与点M重合时AC的长.
如图1,在△OAB和△OCD中,OA=OB,OC=OD,∠AOB=∠COD=40°,连接AC,BD交于点M.填空:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c0fed1bec279a67db01c918711d4f5.png)
②∠AMB的度数为 .
(2)类比探究
如图2,在△OAB和△OCD中,∠AOB=∠COD=90°,∠OAB=∠OCD=30°,连接AC交BD的延长线于点M.请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c0fed1bec279a67db01c918711d4f5.png)
(3)拓展延伸
在(2)的条件下,将△OCD绕点O在平面内旋转,AC,BD所在直线交于点M,若OD=1,OB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
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2018-07-11更新
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4618次组卷
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40卷引用:福建省莆田市城厢区南门学校2023-2024学年九年级下学期开学考试数学试题
福建省莆田市城厢区南门学校2023-2024学年九年级下学期开学考试数学试题河南省2018年中考数学试卷【校级联考】江苏省泰州市泰兴市黄桥教育联盟2019届九年级中考模拟数学试题(3月份)【市级联考】河南省洛阳市2019届九年级中考第一次模拟测试数学试题【校级联考】江苏省连云港市灌云县2019届九年级中考模拟数学试卷【区级联考】山东省东营市垦利区2019届九年级中考一模数学试卷安徽省潜山市第四中学2019届九年级下学期第三次检测数学试题2019年江苏省无锡市江阴市澄要片中考数学模拟试卷(5月份) (已下线)【新东方】【义乌17】【2018】【初三上】2020年江苏省南通市如皋中学中考数学模拟试题2019年湖南省岳阳九中中考数学一模试题江苏省无锡市新吴区2018-2019学年九年级下学期第二次模拟数学试题2019年江苏省连云港市九年级中考模拟数学试题2020年安徽省芜湖市九年级升学一模数学试题2020年安徽合肥市第四十五中学九年级一模数学试题2020年江苏省扬州市江都区实验初级中学九年级一模数学试题2020年吉林省实验中学繁荣学校九年级下学期中考二模数学试题江苏省沭阳县修远中学2019-2020学年九年级下学期第三次月考数学试题2020年江苏省无锡市九年级中考数学模拟试题2020年四川省乐山市井研县中考数学一模试题2020年四川省乐山市井研县九年级初中学业水平适应性考试数学试题(已下线)【万唯原创】2019年河南省中考数学面对面 专题八类比、拓展探究题2020年辽宁省辽阳市九年级7月中考适应性数学试题人教版2020年九年级中考数学重点模型5(已下线)【万唯原创】图形旋转、平移和折叠引起的探究·基础专练(二)湖北省利川团堡初中2020-2021学年九年级上学期12月模拟数学试题(已下线)【万唯原创】2021年河南试题研究-第二部分题型9类型1(已下线)专题27.13 相似三角形的判定(培优篇)(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(人教版)辽宁省沈阳市第一三四中学2021-2022学年九年级上学期期末数学试题江苏省连云港市新海实验中学2019-2020学年九年级下学期期中数学试题2022年山东省淄博市周村区中考数学二模试题(已下线)专题4.21 相似三角形判定定理的证明(培优篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(北师大版)江西省石城县第二中学2021-2022学年九年级下学期第一次集中训练(月考)数学试题2023年湖北省武汉市洪山区九年级下学期3月月考数学试卷河南省南阳市镇平县侯集镇第二初级中学2022-2023学年九年级上学期11月月考数学试题(已下线)2023年武汉一模(几何综合)2024年山东省济南市中考数学模拟预测题(三)2023年广东省东莞市虎门外语学校中考一模数学试题2023年山东省济南市中考数学二轮模拟练习模拟预测题2024年湖北省武汉市武珞路中学中考四调数学试题
2 . 类比、转化、从特殊到一般等思想方法,在数学学习和研究中经常用到,如下是一个案例,请补充完整.
原题:如图1,在▱ABCD中,点E是BC边上的中点,点F是线段AE上一点,BF的延长线交射线CD于点G,若
=3,求
的值.
![](https://img.xkw.com/dksih/QBM/2016/4/19/1574194810609664/1574194816245760/STEM/3247161cded5439797fb299dd74611b1.png)
(1)尝试探究
在图1中,过点E作EH∥AB交BG于点H,则AB和EH的数量关系是 ,CG和EH的数量关系是 ,
的值是
(2)类比延伸
如图2,在原题的条件下,若
=m(m≠0),则
的值是 (用含m的代数式表示),试写出解答过程.
(3)拓展迁移
如图3,梯形ABCD中,DC∥AB,点E是BC延长线上一点,AE和BD相交于点F,若
=a,
=b(a>0,b>0),则
的值是 (用含a,b的代数式表示).
原题:如图1,在▱ABCD中,点E是BC边上的中点,点F是线段AE上一点,BF的延长线交射线CD于点G,若
![](https://img.xkw.com/dksih/QBM/2016/4/19/1574194810609664/1574194816245760/STEM/3314524935a44c79b827ccb82596fab0.png)
![](https://img.xkw.com/dksih/QBM/2016/4/19/1574194810609664/1574194816245760/STEM/2c3878edc864473f98c20fb9c835a298.png)
![](https://img.xkw.com/dksih/QBM/2016/4/19/1574194810609664/1574194816245760/STEM/3247161cded5439797fb299dd74611b1.png)
(1)尝试探究
在图1中,过点E作EH∥AB交BG于点H,则AB和EH的数量关系是 ,CG和EH的数量关系是 ,
![](https://img.xkw.com/dksih/QBM/2016/4/19/1574194810609664/1574194816245760/STEM/2c3878edc864473f98c20fb9c835a298.png)
(2)类比延伸
如图2,在原题的条件下,若
![](https://img.xkw.com/dksih/QBM/2016/4/19/1574194810609664/1574194816245760/STEM/3314524935a44c79b827ccb82596fab0.png)
![](https://img.xkw.com/dksih/QBM/2016/4/19/1574194810609664/1574194816245760/STEM/1da6e0c0889a4789b6a14f2623723042.png)
(3)拓展迁移
如图3,梯形ABCD中,DC∥AB,点E是BC延长线上一点,AE和BD相交于点F,若
![](https://img.xkw.com/dksih/QBM/2016/4/19/1574194810609664/1574194816245760/STEM/69b5722eb02f4009bd8f8accf01f0065.png)
![](https://img.xkw.com/dksih/QBM/2016/4/19/1574194810609664/1574194816245760/STEM/f8325de18dda4c188aa6fc30ae5ac766.png)
![](https://img.xkw.com/dksih/QBM/2016/4/19/1574194810609664/1574194816245760/STEM/fdbafd4957394e08853341cc51b4bb33.png)
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2016-12-06更新
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1068次组卷
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9卷引用:2016届福建省仙游县第三教学片区九年级上学期期末考试数学B卷
真题
3 . 理解:数学兴趣小组在探究如何求tan15°的值,经过思考、讨论、交流,得到以下思路:
.tanD=tan15°=
=
=
.
思路四 …
请解决下列问题(上述思路仅供参考).
(1)类比:求出tan75°的值;
(2)应用:如图2,某电视塔建在一座小山上,山高BC为30米,在地平面上有一点A,测得A,C两点间距离为60米,从A测得电视塔的视角(∠CAD)为45°,求这座电视塔CD的高度;
(3)拓展:如图3,直线
与双曲线
交于A,B两点,与y轴交于点C,将直线AB绕点C旋转45°后,是否仍与双曲线相交?若能,求出交点P的坐标;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94c7f92e59d3935408947e09ca940d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7db8220778c1393408ca223d11f1f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47cfe4e08c06bde245e58aa22485044c.png)
思路二 利用科普书上的和(差)角正切公式:tan(α±β)=.假设α=60°,β=45°代入差角正切公式:tan15°=tan(60°﹣45°)=
=
=
.
思路四 …
请解决下列问题(上述思路仅供参考).
(1)类比:求出tan75°的值;
(2)应用:如图2,某电视塔建在一座小山上,山高BC为30米,在地平面上有一点A,测得A,C两点间距离为60米,从A测得电视塔的视角(∠CAD)为45°,求这座电视塔CD的高度;
(3)拓展:如图3,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8f77e3876694978a22975eff397375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646e11d5bff57e56ce82c2339f2d71ce.png)
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2016-12-06更新
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5卷引用:2015年初中毕业升学考试(福建漳州卷)数学
2015年初中毕业升学考试(福建漳州卷)数学(已下线)决胜2018中考压轴题全揭秘 专题29 新定义和阅读理解型问题河北省保定市博野县2018年程委中学中考数学模拟试卷(已下线)专题02 构造新图或用公式求函数值-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(浙教版)(已下线)数学-2024年中考考前最后一课(11)
真题
4 . 若正方形有两个相邻顶点在三角形的同一条边上,其余两个顶点分别在三角形的另两条边上,则正方形称为三角形该边上的内接正方形,△ABC中,设BC=a,AC=b,AB=c,各边上的高分别记为
,
,
,各边上的内接正方形的边长分别记为
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/10/13/1574246896787456/1574246900645888/STEM/f6abfc03252846709476aba4e0ad00b1.png?resizew=152)
(1)模拟探究:如图,正方形EFGH为△ABC的BC边上的内接正方形,求证:
;
(2)特殊应用:若∠BAC=90°,
=
=2,求
的值;
(3)拓展延伸:若△ABC为锐角三角形,b<c,请判断
与
的大小,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5efe57aca2f76116c2f62fb6f224be26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36ffb82aa1614cd1bc28940b1a7252fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a13393b5c809072cc7c6e4adc5f0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b45804af30183b9f7456223dc497cc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d40b9be052aaa3aa7295b781e7355d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f257d978ee09a8501751fe148b11b11a.png)
![](https://img.xkw.com/dksih/QBM/2016/10/13/1574246896787456/1574246900645888/STEM/f6abfc03252846709476aba4e0ad00b1.png?resizew=152)
(1)模拟探究:如图,正方形EFGH为△ABC的BC边上的内接正方形,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d12ec2372d2e709c9c3a439b1eb8f9b.png)
(2)特殊应用:若∠BAC=90°,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d40b9be052aaa3aa7295b781e7355d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f257d978ee09a8501751fe148b11b11a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5336bc8649d12e131786a5bcd26341f4.png)
(3)拓展延伸:若△ABC为锐角三角形,b<c,请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d40b9be052aaa3aa7295b781e7355d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f257d978ee09a8501751fe148b11b11a.png)
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5 . 阅读材料:如图(1),在
中,
,点P在
边上,
于点
于点F,则
.(此结论不必证明,可直接应用)
如图(2),正方形
的边长为2,对角线
相交于点O,点P在
边上,
于点
于点F,则
______;
(2)【类比与推理】
如图(3),矩形
的对角线
相交于点
点P在
边上,
交
于点E,
交
于点F,求
的值;
(3)【拓展与延伸】
四边形
是半径为4的圆内接四边形,对角线
相交于点O,
,点P在弦
上,
交BD于点E,
交
于点F,当
时,试判断
的值是否为定值,若是请求出该定值并求出四边形
面积的最大值;若不是定值,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1336496362282a03b805c4d14b823308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff6927b60a532649f330cdecf5bf04a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0bfd5c0506342a0127b9d0a1ed9601.png)
如图(2),正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b37625595a63cb47e1cdf9c5da40c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff6927b60a532649f330cdecf5bf04a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de1c2a266873044e21dd02c9f7e4e0e0.png)
(2)【类比与推理】
如图(3),矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32ff7566dfbf1d22bf693f825d83ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7681c103bfed97988a516065d1c7d91a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb754e9542819c137b4c049c5cff66aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bce17597a7a6a83cd4287d424db6b56.png)
(3)【拓展与延伸】
四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46cc1c481e243ca311a6369c8313a18f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d60f55c585f1b455027202684b13e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2103beb858805577d9402209c518828.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bce17597a7a6a83cd4287d424db6b56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c4cfb55d68dfc47530b4604f63d69c.png)
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6 . [基础巩固](1)如图,在
中,
,
,
分别为
,
,
上的点,
,
交
于点
.若
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/18/86daf622-5638-45c3-8f31-dea1bfa8ad60.png?resizew=162)
[尝试应用](2)如图,在等边
中,
,
,
分别为
,
,
上的点,
,
分别交
,
于
,
两点.若
,
,求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/18/ac589bde-54dc-4fda-839c-cb327cfa3636.png?resizew=161)
[拓展提高](3)如图,在
中,
,
与
交于点
,
为
上一点,
交
于点
,
交
于点
.若
,
平分
,
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf5b86308e9f777a6611503ba8d0e9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a329bec5627bf0eb930d1406ac13e483.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/18/86daf622-5638-45c3-8f31-dea1bfa8ad60.png?resizew=162)
[尝试应用](2)如图,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a078495ba47076ccaa28b46f765d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de6935aaa358600eaa3e4806d47e5bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea39c156a4858d85b7f1238eca69f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d410cd694bfec41e3d45a02912c54172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da9624a4bc644c3a349c7c9bf883fbf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/18/ac589bde-54dc-4fda-839c-cb327cfa3636.png?resizew=161)
[拓展提高](3)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22b02f6c8636152aeb62d191251e931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c8d57fddb6933340fd8dd16aae246b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e458dd1ce1c8dcdc2becac146d9dc231.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/842d456ae1a4901a918760ff6e5ead47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7652fd5598a9eaa011726784cae56bc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/144ddbc80b83e03282eb68b278c3ad4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/18/49724643-c96d-464b-b8fe-82d30327c6fb.png?resizew=213)
您最近一年使用:0次
2023-06-13更新
|
231次组卷
|
3卷引用:福建省福州市杨桥中学2023-2024年九年级下学期月考数学试题
名校
7 . 【问题提出】
(1)如图1,在正方形
中,
是对角线,点
在
边上,点
在对角线
上,
,求证:
.
【尝试应用】
(2)如图2,在矩形
中,
,点
在
边上,点
在对角线
上,
,求
的长.
【拓展提高】
(3)如图3,在菱形
中,
,点
在
边上,点
在对角线
上,
,作
交
的延长线于点
的延长线交
于点
,请直接写出
的长.
(1)如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345c91c9e67e6ee00a872078ab17f094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32326495961bdc6376b9cb350cc46453.png)
【尝试应用】
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aebb9945e4d5e46d28d2a78ed09ae715.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a685569db2e908f46a68bd0d1787aa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
【拓展提高】
(3)如图3,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce8859e8af69a03e9684ec0cf2de613.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8653bd6a3527a2a6064799a855f15068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68df3aa79bd6a3f74d1a756bcd6d210c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5eacc2f3bec15eeac3f118761d419b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259b371b6f5c46b7da8422532dab0761.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/ddf710ec-3001-48f5-a3e3-27f93b121de8.png?resizew=439)
您最近一年使用:0次
2024-03-22更新
|
192次组卷
|
3卷引用:2024年福建省南平市光泽县第一中学中考模拟数学试题
名校
8 . (1)问题背景:如图
,
中,
,点
在
上,
于
,求证:
;
(2)尝试应用:如图
,在
中,点
在
上,点
在
上,
,
,
,
,
,求四边形
的面积.
(3)拓展创新:如图
,
,
,
,
,
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8daff96303a07819bd4ee47731e73b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f9400b56d84a05284f4853916751d6.png)
(2)尝试应用:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/f2d8720a77928d51b105a0d32565fdd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a725c6b342a35a22ec8c68d01630b7b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e359046554390192a1b838ec67926819.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2176dac04a8b410e319342fb8e895b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9350992ae22b4fe1ded3fce559e9e24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c42bce098904b241986bb91c65ab33.png)
(3)拓展创新:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860a55cac2dc1655a7b8b38a6629ea76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5984b3e447bb6c97b8e42f73a2627dfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f341b98caabf99bc683ce8407068735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0268d04b9dea7629af27af9a0285a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/02361e2f-984d-441f-8ba4-7e9dccf9242c.png?resizew=404)
您最近一年使用:0次
9 . 若
绕点
逆时针旋转
后,与
构成位似图形,则我们称
与
互为“旋转位似图形”.
(1)知识理解:
如图①,
与
互为“旋转位似图形”.
①若
,
,
,则
;
②若
,
,
,则
;
(2)知识运用:
如图②,在四边形
中,
,
于点
,
,求证:
与
互为“旋转位似图形”;
(3)拓展提高:
如图③,
为等边三角形,点
为
的中点,点
是
边上的一点,点
为
延长线上的一点,点
在线段
上,
,且
与
互为“旋转位似图形”.若
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/29/85a3a9b8-efc1-486d-9917-123979c72886.png?resizew=537)
(1)知识理解:
如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a372076964e7adbfe3bfc390e0bcee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615be61cdec9235a52d7779ea95e2b83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbb676d7f8784aaa4ea2c7f500fe9c4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4af17b55fa474f0103a858c2604b093.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eab2ccc075e9eb14adcaad5feaf69896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
(2)知识运用:
如图②,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e7ed62a6b2a0ea9eee7513c16130e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
(3)拓展提高:
如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119e066d5bc6229d203536a09e55ced7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbf5459b20ca890a47ebf8d51d90cc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07bff284d93d968b73484cb9e8eef8c0.png)
您最近一年使用:0次
10 . 【课本再现】
(1)如图1,在
中,
,
,D,E分别是
,
的中点.求证:
,
.
【操作发现】
(2)如图2,将图1的
先沿着直线
翻折得到
,再将
绕着点F顺时针旋转
得到
,连接
,分别作
,
的中点D,E,连接
.猜想
与
的关系,并进行证明;
【拓展延伸】
(3)如图3,将(2)中的“旋转
”改成“旋转任意角度”,其他条件不变,问DE与
的关系是否发生改变?并说明理由.
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6047a0228d514ad935f42f5bc881c1.png)
【操作发现】
(2)如图2,将图1的
![](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/36691f0269294ecae8f00b7bce97756c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36691f0269294ecae8f00b7bce97756c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544880df0efaebf03ab4814dc422dec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
【拓展延伸】
(3)如图3,将(2)中的“旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
您最近一年使用:0次
2023-07-09更新
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257次组卷
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3卷引用:2023年福建省福州市九校教学联盟中考模拟数学试题