如图1,矩形ABCD中,点E为AB边上的动点(不与A,B重合),把
沿DE翻折,点A的对应点为
,延长
交直线DC于点F,再把
折叠,使点B的对应点
落在EF上,折痕EH交直线BC于点H.
![](https://img.xkw.com/dksih/QBM/2019/7/18/2249558456516608/2249630340481024/STEM/be15ce2d2dc747929ba39288776c1998.png?resizew=467)
(1)求证:
;
(2)如图2,直线MN是矩形ABCD的对称轴,若点
恰好落在直线MN上,试判断
的形状,并说明理由;
(3)如图3,在(2)的条件下,点G为
内一点,且
,试探究DG,EG,FG的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69411c6c7c32c7907312923a0e0bfc1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://img.xkw.com/dksih/QBM/2019/7/18/2249558456516608/2249630340481024/STEM/be15ce2d2dc747929ba39288776c1998.png?resizew=467)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a9cd835902ee5a1103c006d3b80ad0.png)
(2)如图2,直线MN是矩形ABCD的对称轴,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
(3)如图3,在(2)的条件下,点G为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcae1638beb0eb11b7524b8f3294de19.png)
2019·湖南郴州·中考真题 查看更多[8]
湖南省郴州市2019年中考数学试题2020年海南省中考数学模拟试卷(一)(已下线)【万唯原创】图形的对称·满分特训(三)四川省成都市简阳市2020-2021学年九年级上学期12月月考数学试题重庆市梁平区2020-2021学年九年级上学期期末数学试题(已下线)专题14 动态几何(考点)-备战2021年中考数学考点微专题(上海专用)2021年青海省海东市中考一模数学试题(已下线)1.2 矩形的性质与判定(习题)-2022-2023学年九年级数学上册同步精讲精练(北师大版)
更新时间:2019-07-18 19:07:33
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解答题-作图题
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【推荐1】如图是由边长为1的小正方形组成的方格图.
![](https://img.xkw.com/dksih/QBM/2022/11/15/3110361996353536/3111638275563520/STEM/c5f7dca2d5634f50851cb27d3ddfb820.png?resizew=231)
(1)请在方格图中建立平面直角坐标系,使点A的坐标为
,点B的坐标为
;点C的坐标为
,画出
;
(2)在图中作出
关于y轴的对称图形
(其中点A、B、C的对称点分别为点
、
、
)
(3)P是x轴上的动点,当
为等腰三角形时,写出P点坐标______.
(4)P是x轴上的动点,Q是线段
上的动点,
的最小值是______.
![](https://img.xkw.com/dksih/QBM/2022/11/15/3110361996353536/3111638275563520/STEM/c5f7dca2d5634f50851cb27d3ddfb820.png?resizew=231)
(1)请在方格图中建立平面直角坐标系,使点A的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727b01efc442965897875a2cd4e18fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd5c6440cda9f4bd78148c7eea8c0b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e157b974ba12242b3dfb714eda25ff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)在图中作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(3)P是x轴上的动点,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
(4)P是x轴上的动点,Q是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce71374dc2a4f42ffa262a761bbbb383.png)
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【推荐2】如图
,在
中,
,点
为
的中点,连接
.点
在射线
上运动,当点
不与点
重合时,连接
.设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/238f392f-7f8e-4b83-b780-f970639b778d.png?resizew=395)
(1)
的长为________;
(2)当
是直角三角形时,求
的值;
(3)当
是轴对称图形时,求
的面积;
(4)如图
,作点
关于直线
的对称点
,连接
,当点
三点共线时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca85984ac3628e78fb2de5dba1951f81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e89fb9648fb097286c29ba692ea4a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da6b93dbe5272a5167ff4e2918bec864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a666403569e607f32af5f762c246dc7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/238f392f-7f8e-4b83-b780-f970639b778d.png?resizew=395)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
(4)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93ce3efd4d44c7928f3ee0f3deccd6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af43b1569f8d9af919b6ec87a5fe55b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0121a4261dbb5ebb73e51f99af95a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】问题发现:
(1)如图
,在
中,
,
为
的中点,以
为直角边,在
下方作等腰直角
,其中
以
为直角边,在
上方作等腰直角
,其中
,
与
交于点
.求证:
.
类比探究:
(2)如图
,若将
绕点
顺时针旋转
,则
中的结论是否仍然成立?请说明理由;
拓展延伸:
(3)如图
,在
的条件下,再将等腰直角
沿直线
向右平移
个单位长度,得到
,若
,试求
的值.(用含
,
的式子表示)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ca8c47ea5e4395ff0534c0fbc5d403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b925c3aac629bf8e3e3cdc2bae28738e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d11746005a0e806f2d27f89e3d9e9c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5555128cca1e698695f707d8597b238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e59617707e98c3441445392333b491.png)
类比探究:
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
拓展延伸:
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fde147331c6f73d86bb6a4c20a115a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db9724336e8c891e64f24b5f0977130d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/2e35e5f2-6cbb-4901-b433-5a9c9b1f0f50.png?resizew=429)
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【推荐2】【几何感知】如图(1),在
中,点D为BC边上一点,连接AD,点P为线段AD上一点,连接PB、PC得到有公共边的两个
和
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/d6a53009-c347-4b86-aa69-19cc99bfacd2.png?resizew=494)
【类比迁移】如图(2),在
中,点D、E、F分别为线段BC、AC、AB上的点,线段AD、BE、CF交于点P,若
,
,则
.
【拓展迁移】如图(3),在
中,∠ABC=90°,AB=3,BC=4,点P为
内部一点,且
,则线段AP= .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c222c23ada56d2b1bd816267fdf3413.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/d6a53009-c347-4b86-aa69-19cc99bfacd2.png?resizew=494)
【类比迁移】如图(2),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d38cce21b48df42041e4b8b2a7db7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8896d36ad57579470ca8301ccb12636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6930745b03c52783996c8d242cce0529.png)
【拓展迁移】如图(3),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24aad8e4b5c365d069eecad526fe54a1.png)
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解题方法
【推荐3】如图,抛物线y=-x2+bx+c与直线AB交于A(-4,-4),B(0,4)两点,直线AC:y=-
交y轴与点C,点E是直线AB上的动点,过点EF∥y轴交AC于点F,交抛物线于点G.
![](https://img.xkw.com/dksih/QBM/2021/12/3/2864445397942272/2865452540862464/STEM/4b249a83-8002-43bd-bbfd-6b7f00955961.png?resizew=156)
(1)直接写出抛物线y=-x2+bx+c的解析式为_______;
(2)在y轴上存在一点H,连接EH,HF,当点E运动到什么位置时,以A,E,F,H为顶点的四边形是矩形?求出此时点E,H的坐标;
(3)在(2)的前提下,以点E为圆心,EH长为半径作圆,点M为圆E上一动点,求
AM+CM的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d71cf709f134984b3429598167fca89d.png)
![](https://img.xkw.com/dksih/QBM/2021/12/3/2864445397942272/2865452540862464/STEM/4b249a83-8002-43bd-bbfd-6b7f00955961.png?resizew=156)
(1)直接写出抛物线y=-x2+bx+c的解析式为_______;
(2)在y轴上存在一点H,连接EH,HF,当点E运动到什么位置时,以A,E,F,H为顶点的四边形是矩形?求出此时点E,H的坐标;
(3)在(2)的前提下,以点E为圆心,EH长为半径作圆,点M为圆E上一动点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
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