解题方法
1 . (1)在△ACB中,∠ACB=90°,CD⊥AB于D,点E在AC上,BE交CD于点G,EF⊥BE交AB于点F.
①如图1,AC=BC,点E为AC的中点,求证:EF=EG;
②如图2,BE平分∠CBA,AC=2BC,试探究EF与EG的数量关系,并证明你的结论;
(2)如图3,在△ABC中,若
,点E在边AB上,点D在线段BC的延长线上,连接DE交AC于M,∠CMD=60°,DE=2AC,
,直接写出BE的长.
①如图1,AC=BC,点E为AC的中点,求证:EF=EG;
②如图2,BE平分∠CBA,AC=2BC,试探究EF与EG的数量关系,并证明你的结论;
(2)如图3,在△ABC中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a7e2fa813ac46cf097ca6714ee008d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93123510ac4da899e3227a0211c576e.png)
![](https://img.xkw.com/dksih/QBM/2020/4/15/2442182693240832/2442741242363904/STEM/e920eccc818c4a79b4779f0ae1b44ac7.png?resizew=479)
您最近一年使用:0次
名校
2 . 探究与应用:在学习几何时,我们可以通过分离和构造基本图形,将几何“模块”化.例如在相似三角形中,
字形是非常重要的基本图形,可以建立如下的“模块”(如图①):
![](https://img.xkw.com/dksih/QBM/2020/4/9/2437929981796352/2438543728754688/STEM/ecbfce6e-b87e-4b02-aee5-f740876ce0fb.png)
(1)请就图①证明上述“模块”的合理性;
(2)请直接利用上述“模块”的结论解决下面两个问题:
①如图②,已知点
,点
在直线
上运动,若
,求此时点
的坐标;
②如图③,过点
作
轴与
轴的平行线,交直线
于点
,求点
关于直线
的对称点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://img.xkw.com/dksih/QBM/2020/4/9/2437929981796352/2438543728754688/STEM/ecbfce6e-b87e-4b02-aee5-f740876ce0fb.png)
![]() |
(1)请就图①证明上述“模块”的合理性;
(2)请直接利用上述“模块”的结论解决下面两个问题:
①如图②,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfdcafe3439957b220678c275900fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf37c615830363549e52a2976537d807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b9931cfb6a0ba33cb6e11e569a8cee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
②如图③,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfdcafe3439957b220678c275900fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf37c615830363549e52a2976537d807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c29a7e8eea08197bf53164a560bee58.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
您最近一年使用:0次
2020-04-10更新
|
532次组卷
|
3卷引用:江苏省苏州市太仓市双凤中学2018-2019学年八年级下学期期末数学试题
解题方法
3 . 综合与探究
如图,已知抛物线
经过点
,定点为
,对称轴
交
轴于点
.点
的坐标为
,点
是在
轴下方的抛物线对称轴上的一个动点,
交
于点
,
轴交射线
于点
,作直线
.
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481767594696704/2484501070422016/STEM/d9cc1b31-6452-4935-83c2-03393f78aa88.png?resizew=176)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481767594696704/2484501070422016/STEM/c4388ff7-7c2e-4935-bdba-db820657db38.png?resizew=177)
(1)求点
的坐标;
(2)如图1,当点
恰好落在该抛物线上时,求点
的坐标;
(3)如图2,当
时,判断点
是否在直线
上,说明理由;
(4)在(3)的条件下,延长
交
于点
,取
中点
,连接
,探究四边形
是否为平行四边形,并说明理由.
如图,已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a69144e8a38f3ed31018d5a21b026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cda239c1519c63b65af43a195c16fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/7aa2e31608e60e3fd40c040cfe9d6e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b4d23b08333d8e576f894733dbb933e.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/6bfd69b0208303186bf650cd86f14d7a.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/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481767594696704/2484501070422016/STEM/d9cc1b31-6452-4935-83c2-03393f78aa88.png?resizew=176)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481767594696704/2484501070422016/STEM/c4388ff7-7c2e-4935-bdba-db820657db38.png?resizew=177)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
(4)在(3)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf905a242c0ceb28f24cee977107e346.png)
您最近一年使用:0次
2020九年级上·全国·专题练习
解题方法
4 . 课外兴趣小组活动时,老师提出了如下问题.
如图1,△ABC中,若AB=12,AC=8,求BC边上的中线AD的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/c646416e-f288-4c0f-aeb2-26b78b6c5473.png?resizew=567)
小颖在组内经过合作交流,得到了如下的解决方法:如图2,延长AD到点E,使DE=AD,连结BE.请根据小颖的方法思考:
(1)由已知和作图能得到△ADC≌△EDB,依据是 ;
A.SSS B.SAS C.AAS D.HL
(2)由“三角形的三边关系”可求得AD的取值范围是 .
解后反思:题目中出现“中点”“中线”等条件,可考虑延长中线构造全等三角形,把分散的已知条件和所求证的结论集合到同一个三角形中.
完成上题之后,小颖善于探究,她又提出了如下的问题,请你解答.
(3)在△ABC中,D是BC上一点,连结AD,E是AD上一点,连结BE并延长交边AC于点F.
①如图3,若AD是△ABC的中线,且AF=EF,求证:AC=BE.
②如图4,若E是BF的中点,求证:AF•CD=AC•BD
如图1,△ABC中,若AB=12,AC=8,求BC边上的中线AD的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/c646416e-f288-4c0f-aeb2-26b78b6c5473.png?resizew=567)
小颖在组内经过合作交流,得到了如下的解决方法:如图2,延长AD到点E,使DE=AD,连结BE.请根据小颖的方法思考:
(1)由已知和作图能得到△ADC≌△EDB,依据是 ;
A.SSS B.SAS C.AAS D.HL
(2)由“三角形的三边关系”可求得AD的取值范围是 .
解后反思:题目中出现“中点”“中线”等条件,可考虑延长中线构造全等三角形,把分散的已知条件和所求证的结论集合到同一个三角形中.
完成上题之后,小颖善于探究,她又提出了如下的问题,请你解答.
(3)在△ABC中,D是BC上一点,连结AD,E是AD上一点,连结BE并延长交边AC于点F.
①如图3,若AD是△ABC的中线,且AF=EF,求证:AC=BE.
②如图4,若E是BF的中点,求证:AF•CD=AC•BD
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解题方法
5 . 如图1,在
中,
,在斜边
上取一点
,过点
作
,交
于点
,现将
绕点
旋转一定角度到如图2所示的位置(点
在
的内部,使得
).
![](https://img.xkw.com/dksih/QBM/2020/12/7/2609019259191296/2609746346844160/STEM/a126b30ed10c4f2697106af256fda1d2.png?resizew=650)
(1)①求证:
; ②若
,求
的长.
(2)如图3,将原题中的条件“
”去掉,其它条件不变,设
,若
,求
的值.
(3)如图4,将原题中的条件“
”去掉,其它条件不变,若
,设
,试探究
三者之间满足的等量关系.(直接写出结果,不必写出解答过程)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bbd85114fc452f4b2469f755c1ad83e.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a078495ba47076ccaa28b46f765d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca663b5d4115d9543491286cfd2f1b58.png)
![](https://img.xkw.com/dksih/QBM/2020/12/7/2609019259191296/2609746346844160/STEM/a126b30ed10c4f2697106af256fda1d2.png?resizew=650)
(1)①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa98026a648010decfaf672dc9141c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23052779a1435697ff5e0c92a332e298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图3,将原题中的条件“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a5e83459a87809b93623ee79230108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f52178fe92202774ba90ce28d61398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)如图4,将原题中的条件“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfbb9ffbe6d8fc371c30562ebdaa827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb84eb422b8d24b54eef9910d3089618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b511bcbe94aa484c0a067891fbf7968.png)
您最近一年使用:0次
2020-12-08更新
|
412次组卷
|
3卷引用:浙江省湖州市九校2017届九年级四月联合模拟数学试题
6 . 定义:有一组对角互余的四边形叫做对余四边形.
理解:
(1)若四边形
是对余四边形,则
与
的度数之和为______;
证明:
(2)如图1,
是
的直径,点
在
上,
,
相交于点D.
求证:四边形
是对余四边形;
(3)如图2,在对余四边形
中,
,
,探究线段
,
和
之间有怎样的数量关系?写出猜想,并说明理由.
理解:
(1)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
证明:
(2)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)如图2,在对余四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d4e574c9d139615d991a168cfbf63b.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/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
2020-07-21更新
|
1921次组卷
|
12卷引用:湖北省咸宁市2020年中考数学试题
湖北省咸宁市2020年中考数学试题浙江省余姚市兰江中学2020-2021学年九年级上学期第二次月考数学试题(已下线)重难点06 几何类综合问题-2021年中考数学【热点·重点·难点】专练2021年广东省深圳市九年级中考模拟卷(四)2021年江苏省扬州市广陵区树人学校中考数学一模试卷 (已下线)【万唯原创】2021年河南省面对面-专题练-专题10+112021年山东省威海乳山市(五四制)中考模拟数学试题(一) 2023年江苏省淮安市淮安经济技术开发区九年级中考一模数学试题 (已下线)黄金卷07-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷(江苏徐州专用)2024年湖北省十堰市茅箭区中考一模数学试题2024年湖南省长沙市长沙县中考一模数学试题(已下线)数学-2024年中考考前最后一课(4)
7 . 问题背景:如图,四边形
中,
,
,
,
,
,
为边
上一动点,连接
、
.
问题探究
(1)如图1,若
,则
的长为__________.
(2)如图2,请求出
周长的最小值;
(3)如图3,过点
作
于点
,过点
分别作
于
,
于点
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
①是否存在点
,使得
的面积最大?若存在,求出
面积的最大值,若不存在,请说明理由;
②请直接写出
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0facf189b2a3153beb7b9e077d3b1146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb24be4fa6d823eff33e7797d337c13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6834ac70927ae08d7d36a1922403c9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.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/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
问题探究
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfddba15eea41271e929114b41cc317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(2)如图2,请求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
(3)如图3,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddade54fa8a7cc4b0a7914761d48102e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d0d3ac8f3f181d54743d2151158942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
①是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
②请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/7/4429c795-b20a-4dd0-a064-c55ffa06b049.png?resizew=375)
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8 . 如图,在平面直角坐标系xOy中,抛物线y=ax2+bx+c(a>0)与x轴相交于A(﹣1,0),B(3,0)两点,点C为抛物线的顶点.点M(0,m)为y轴上的动点,将抛物线绕点M旋转180°,得到新的抛物线,其中B、C旋转后的对应点分别记为B'、C'.
(1)若a=1,求原抛物线的函数表达式;
(2)在(1)条件下,当四边形BCB'C'的面积为40时,求m的值;
(3)探究a满足什么条件时,存在点M,使得四边形BCB'C'为菱形?请说明理由.
(1)若a=1,求原抛物线的函数表达式;
(2)在(1)条件下,当四边形BCB'C'的面积为40时,求m的值;
(3)探究a满足什么条件时,存在点M,使得四边形BCB'C'为菱形?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/49f4d497-4444-448d-9022-8cd3dddbe2fb.png?resizew=182)
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9 . 在
中,
,
是平面内不与点
重合的任意一点,连接
,将线段
绕点
顺时针旋转
得到线段
,连接
是
的中点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/90c3242f-50a3-4eea-a330-92e84882ea1a.png?resizew=408)
(1)问题发现:
如图1,当
时,
的值是_________,直线
与直线
相交所成的较小角的度数是________.
(2)类比探究:
如图2,当
时,请写出
的值及直线
与直线
相交所成的较小角的度数,并说明理由.
(3)解决问题:
如图3,当
时,若
是
的中点,点
在直线
上,且点
在同一条直线上,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3f6042c22f6b5529a85228db5b9836.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/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484b2da77d4f99cefd3425b7ac807491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/90c3242f-50a3-4eea-a330-92e84882ea1a.png?resizew=408)
(1)问题发现:
如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3836da2ded634157d26dfdadf375c691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d50994a4b0c4ac97c4c3cbaa5a369d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)类比探究:
如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2633314dca947d68468a46ae6dfaa7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d50994a4b0c4ac97c4c3cbaa5a369d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(3)解决问题:
如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f5423729ceac1cb71f4a2fdf4ac12b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853a0ff3b326383dc943ba305d90d0c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dca7b2fb688954f8644f6e2517f2ccc.png)
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2020-04-15更新
|
6569次组卷
|
7卷引用:河南省周口市川汇区2019-2020学年九年级上学期期末数学试题
河南省周口市川汇区2019-2020学年九年级上学期期末数学试题河南省百校联考2019-2020学年九年级下学期数学试题2020年河南省九年级中考百校大联考在线数学试题2020年河南省七地市九年级一模数学试题(已下线)【万唯原创】河南省中考数学-河南缺题-类比探究上(已下线)手拉手模型(已下线)【万唯原创】2021年河南专项集训-压轴题题组集训1
解题方法
10 . 如图,二次函数
(其中
)的图像与
轴交于
、
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/2020/6/23/2491027356237824/2493218170306560/STEM/16a54ad187cc41ea94eab4682c7cbdb7.png?resizew=196)
(1)点
的坐标为 ,
;
(2)若
为
的外心,且
与
的面积之比为
,求
的值;
(3)在(2)的条件下,试探究抛物线
上是否存在点
,使得
,若存在,求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e913b6ab23c6dda1ee0b69350632b13b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2020/6/23/2491027356237824/2493218170306560/STEM/16a54ad187cc41ea94eab4682c7cbdb7.png?resizew=196)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db07c6ce6c8b0e96a3470c6a3491334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2ffe216a34f1d35cc9bc608a0b56b6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f8f01137e92c0f2e63467036ae9cce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/457509410d8b96672b7c34e84dc47ae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89191537c0a872632081c371253614b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)在(2)的条件下,试探究抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e913b6ab23c6dda1ee0b69350632b13b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb66348a0f815591cc9ec55889b40963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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