1 . (1)用数学的眼光观察.
如图1,在菱形
中,
,点E是对角线
上一动点,连接
,将
绕点E顺时针旋转
得到
,连接
,
.求
的度数.
(2)用数学的思维思考.
如图2,在正方形
中,点E是对角线
上一动点,且
,连接
,将
绕点E顺时针旋转
得到
,连接
,
.判断C,D,F三点的位置装关系,并说明理由;
(3)用数学的语言表达.
如图3,在矩形
中,
,
,点E是对角线
上一动点,连接
,以
为边在
的右边作直角
,
,
,连接
,
,若
是以
为腰的等腰三角形,求
的长度.
如图1,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7316430d26a6f4bcc0bdadfd1a5330a.png)
(2)用数学的思维思考.
如图2,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b22529fdccd1f84fa42eb23df0cb2d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)用数学的语言表达.
如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9228b213dc6b256b752b38a466ebec93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7521601ac1fbc4a52d4fe44be9c8e88c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594bc35dbb72ec279107fb861a9a3c86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
2024-03-22更新
|
262次组卷
|
3卷引用:2024年辽宁省沈阳市大东区模拟预测数学模拟预测试题
2024年辽宁省沈阳市大东区模拟预测数学模拟预测试题2024年辽宁省沈阳市大东区3月中考数学模拟预测试题(已下线)重难点05 几何压轴综合(8大题型+满分技巧+限时分层检测)-2024年中考数学【热点·重点·难点】专练(上海专用)
2 . 在正方形
中,P为直线BC上一点(不与点B和点C重合),过点B作
于点E,过点C作
于点F,
交
于H,O为
的中点,连接
,
.
;
②求证:
垂直平分
;
(2)如图2,当点P在
的延长线上运动时,求证:
垂直平分
;
(3)连接
,
,当
为等腰三角形时,
的值为________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03d3b1a7b201f380f960db4b6ff2943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53d75c9f420d2995e908b40a68a1ed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58de2907b36ad810d1a0ebd77f07975c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
图(1) 图(2)
(1)如图1,①求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a4febd04cfb5e70fa42de27398044ee.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)如图2,当点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f94ad6cf5f11c1fedb78462429c774.png)
您最近一年使用:0次
2024-03-20更新
|
120次组卷
|
2卷引用:2023年辽宁省沈阳市和平区三校优生九年级 联考数学模拟试题
3 . 在矩形
中,点
是射线
上一动点,连接
,过点
作
于点
,交直线
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/8f041c7e-b4c9-49bb-b2f7-45ebf7591594.jpg?resizew=437)
(1)当矩形
是正方形时,以点
为直角顶点在正方形
的外部作等腰直角三角形
,连接
. 如图1,若点
在线段
上,则线段
与
之间的数量关系是__________,位置关系是__________;
(2)如图2,若点
在线段
上,以点
为直角顶点在矩形
的外部作直角三角形
,且
,连接
. 判断线段
与
之间的数量关系与位置关系,并证明;
(3)如图3,若点
在线段
的延长线上,
在线段
的延长线上,
,且
,
,连接
是
中点,连接
,直接写出
的值.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/8f041c7e-b4c9-49bb-b2f7-45ebf7591594.jpg?resizew=437)
(1)当矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630a21ba7a8e1b8bca73c1634cc6f74d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630a21ba7a8e1b8bca73c1634cc6f74d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99085da89457ee78a2363c3cbaca5043.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
(3)如图3,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67e4abf5ad77926b33250de63614e23e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5d0fd238953785bdfa233f213031dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a559726c6819aaeca420bbd71d285825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c611ef653c05ae504e40c6a31863d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78892386fe97a8a4fdd1c6c38f0ed51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9e953a4a5f98c96bbe67cbaadf76d9.png)
您最近一年使用:0次
4 . 【问题初探】
(1)如图1,在四边形
中,
,
,
、
分别是
、
上的点,且
,探究图中
,
,
之间的数量关系.甲同学探究此问题的方法:延长
到点
,使
.连接
.先证明
,再证
,请你根据甲同学的解题思路直接写出
,
,
之间的数量关系 .
【类比分析】
像(1)题一样,当已知(或求证)一条线段等于另外两条线段的和(或差)时,经常用到这种方法——截长补短法构造全等三角形来完成证明过程,这样可以利用转化思想,把两条线段的和(或差)转化成一条线段,从而降低解题难度.请你用这种方法解答(2).
(2)如图2,若在四边形
中,
,
,
,
分别是
,
上的点.且
,上述结论是否仍然成立?请说明理由.
【学以致用】
(3)如图3,在四边形
中,
,
.若点
在
的延长线上,点
在
的延长线上,且
,请直接写出
与
之间的数量关系.
(1)如图1,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21eb847a1722ed6e10e23c59d53fe7d3.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e370923be3d4b7034a5992065b5f7d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d598f4a17ac14970ade9f381e9aee970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc180eda08edfb6d54eb04da7741f099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5fa49d0a11e3ba9d1e11be912200e3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd003322b07c461609d917912f0ec521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d598f4a17ac14970ade9f381e9aee970.png)
【类比分析】
像(1)题一样,当已知(或求证)一条线段等于另外两条线段的和(或差)时,经常用到这种方法——截长补短法构造全等三角形来完成证明过程,这样可以利用转化思想,把两条线段的和(或差)转化成一条线段,从而降低解题难度.请你用这种方法解答(2).
(2)如图2,若在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d96818c1c8bf5b4ede75388ba3997b7.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e370923be3d4b7034a5992065b5f7d7.png)
【学以致用】
(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4579332087ee585f1cae423a6ae1862.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e370923be3d4b7034a5992065b5f7d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/a6f91621-c37c-49a4-9e25-af660aec5660.png?resizew=473)
您最近一年使用:0次
5 . 【问题初探】
数学课上张老师在讲完正方形的性质之后提出了一个问题:
四边形
是边长为3的正方形,点E是边
上的一动点,连接
,以
为一边作正方形
(点C,E,F,G按顺时针方向排列),连接
,
.
(1)如图1,求点G到
的距离,请写出解答过程;
【类比分析】
爱动脑的数学兴趣小组在研讨的过程中,也提出了一个问题:
(2)如图2,当
经过点D时,求
的长,请写出解答过程;
【学以致用】
看到同学们兴致勃勃的样子,张老师说:“角相等可以是三角形全等的条件,也能推导出相似”,于是给同学们留了一道思考题:
(3)求代数式
的最小值.经过小组研讨,组长小明进行了整理,给出了部分解题思路;
解题思路:如图3,作等腰直角
,使
,连接
,
,
,则点C,D,
三点共线,
由
,
,可得
,
由
,
,可得
,
……
请完成“……”部分的解答过程.
数学课上张老师在讲完正方形的性质之后提出了一个问题:
四边形
![](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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(1)如图1,求点G到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
【类比分析】
爱动脑的数学兴趣小组在研讨的过程中,也提出了一个问题:
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
【学以致用】
看到同学们兴致勃勃的样子,张老师说:“角相等可以是三角形全等的条件,也能推导出相似”,于是给同学们留了一道思考题:
(3)求代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50441dc5bcc1c1cde7ee49f5ee7a8ff9.png)
解题思路:如图3,作等腰直角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b454114cb14eb56f9afecc687746987c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d898864bb46c7003a5c228b1d16d47d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e95e6cffd03f49defd13c07d74002f37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d806e706bfa5d8e7a342be859321ee4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c0ef44160eb1d69d79a98c5de9a41ba.png)
由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05412602169453e2d976b9f701dffcb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764fce5fe3ce09b3b8f719eacf810867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52af06792ee78e98424e3d844529ab94.png)
……
请完成“……”部分的解答过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/6f7b4786-e85a-4c18-afda-11695e0b47b7.png?resizew=480)
您最近一年使用:0次
6 . 【问题提出】
如图1,在正方形
中,点E,F分别在
边上,且
,连接
.探究线段
之间的数量关系.
【方法感悟】
(1)小明组同学利用构造全等三角形的方法探究三条线段的关系:如图2,延长
到点G,使
,连接
,先证明
,再证明
,从而得到正确结论.小明组同学的结论是___________;
小亮组同学对小明组构造全等三角形的环节提出了不同的看法,借助旋转三角形的方式探究问题:将
绕点A顺时针旋转90°得到
,再证明
,从而得到与小明组相同的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/4194d793-1550-4e2e-aa10-0f8a33d87114.png?resizew=302)
【方法迁移】
(2)如图3,在
中,
,沿边
翻折得到
,点B的对应点为点D,点E,F分别在
边上,且
.试猜想线段
之间的数量关系,并证明你的猜想.
【问题拓展】
(3)如图4,在四边形ABCD中,
,点E,F分别在
边上,且
,试猜想当
与
满足什么关系时,可使得
.请直接写出你的猜想.
(4)如图5,在四边形
中,
,
,
与
为对角线,
.若
,
,求
的长.
如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced9844fe2e052c70486af0740afa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180942edc839b9fda741b055df87216b.png)
【方法感悟】
(1)小明组同学利用构造全等三角形的方法探究三条线段的关系:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b555a0bb6b5132ecfb9cae3769912c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828d0ee008783093cbe6de3f5147bcb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7d143a1d6ba708f17021e41efd7d9a.png)
小亮组同学对小明组构造全等三角形的环节提出了不同的看法,借助旋转三角形的方式探究问题:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc727c642cbc2181476b7dd8eca471e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7d143a1d6ba708f17021e41efd7d9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/4194d793-1550-4e2e-aa10-0f8a33d87114.png?resizew=302)
【方法迁移】
(2)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced9844fe2e052c70486af0740afa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180942edc839b9fda741b055df87216b.png)
【问题拓展】
(3)如图4,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced9844fe2e052c70486af0740afa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99627df7b1a88b9bf3dda20390d245.png)
(4)如图5,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7305de9211785b826823153897b17517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669f7a1e43ef893ef3a45fc47992947f.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/b2915ea6f8ea0cb67a6b135ff275b4e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/7872072e-8e14-41b4-88ca-a0923e1c29d7.png?resizew=459)
您最近一年使用:0次
2024-01-10更新
|
390次组卷
|
3卷引用:辽宁省沈阳市于洪区2023-2024学年九年级上学期期末数学试题
7 . 如图,正方形
的边长为4,点
分别在边
上,且
平分
,连接
,分别交
于点
是线段
上的一个动点,过点
作
垂足为
,连接
,有下列四个结论:①
垂直平分
;②
的最小值为
,③
,④
.其中正确的有______ .(填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa7d487586e3702f55cd2d6466654bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f2e8022fe29c2c3fa361ac7cdc26da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f153d18212ed1073fce57ead5a591c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/525d7e6917760988c0ebae76132fd8e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2266e69609856fe64931c6810bc7778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9887e1ff61308713287d592c8e8d942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb1548ddc0e5536a35b1bd78c4e7cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af2fdf1944afebb51cb6a5e6c74aadd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/569b3d6a23459e586ead541d8c63d636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9d5a503241c275b7aee8a2eefcceaad.png)
您最近一年使用:0次
2024-01-04更新
|
183次组卷
|
2卷引用:辽宁省锦州市凌河区第八初级中学2023-2024学年九年级上学期12月月考数学试题
8 . 如图,正方形
的对角线相交于
,点
,
分别是边
,
上的动点(不与点
,
,
重合),
,
分别交
于
,
两点,且
,则下列结论:
①
;②
;③
;④
是等腰三角形.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/cf8f4012-549e-4312-9090-a5d0cb8bea99.png?resizew=147)
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/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/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/b4794cf7c57bdd4825d9e6615e2527a4.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d8c24906872c98c181f198ee0ab6e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8881c443e6e767728d6f8d9a083e37f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22cdec163ca93925a15021425653e7ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf60421699db0d4b46f61ecec5cf82a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/cf8f4012-549e-4312-9090-a5d0cb8bea99.png?resizew=147)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
2023-11-04更新
|
174次组卷
|
5卷引用:辽宁省丹东市第十七中学2019-2020学年九年级上学期11月月考数学试题
9 . 阅读材料:小明遇到这样一个问题,如图1,点E,F分别在正方形
的边
上,
,连接
,则
,试说明理由.
小明通过探究,为同学们提供了解题的想法:延长
至点G,使
(如图2),通过两次三角形全等即可证明.
(1)请沿着小明的思路完成本题的证明思路;
参考小明同学思考问题的方法,解决下面两个问题
(2)如图,在四边形
中,
,点E,F分别在边
上,
,
,探索并证明
之间的数量关系.
(3)如图,在
中,
,点D,E均在边
上,且
,探素并证明
,
,则
__________(直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ced324a15510f9cf7518d8c277c6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10180bbac09e18d7fa63c011378a1b38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/012ee29d520838fa559c40d0b074f9a9.png)
小明通过探究,为同学们提供了解题的想法:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc180eda08edfb6d54eb04da7741f099.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/cac5bcd7-a3a1-49c9-988d-617eb8471aa9.png?resizew=276)
(1)请沿着小明的思路完成本题的证明思路;
参考小明同学思考问题的方法,解决下面两个问题
(2)如图,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c4fd10247378996f17429e4f31e8d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ced324a15510f9cf7518d8c277c6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b00b05926d387ae0ea9c8fc0d090a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a45bb0e736a231e0179772a5c036124.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/07da2f0c-a72d-4b39-afdf-148f6cb5cf0b.png?resizew=148)
(3)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca953908acbc1e41920619c72ea7e2e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/214d99ce9f50286dcff41db85083c979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404728d0ea2699c71e674f30dd984abd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/9e1ab4ae-e680-4e4b-bf89-163c627eef64.png?resizew=156)
您最近一年使用:0次
10 . 已知正方形
和等腰直角三角形
,
,连接
,
,
,
,点G,H,I分别为线段
,
,
的中点,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/599fe0d3-f0dd-4dea-8c73-e755bd009b8b.png?resizew=437)
(1)如图1,当点B,A,F在一条直线上时,请直接写出线段
与
的关系;
(2)如图2,将
绕点A顺时针旋转
,判断线段
与
的关系,并说明理由;
(3)在(2)的条件下,若
,
,
,
,
的面积分别为
,
,
.
①请直接写出
与
大小关系;
②直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cec68a1111227d3b2aa12b291dc8216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19247393d6b9122742a1a926ff495314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc29330979e64e99678423e58759779.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/599fe0d3-f0dd-4dea-8c73-e755bd009b8b.png?resizew=437)
(1)如图1,当点B,A,F在一条直线上时,请直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19247393d6b9122742a1a926ff495314.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb1aa7bc4a01962fc1297f17fa9128f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19247393d6b9122742a1a926ff495314.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f45cc40e62290847607892d59c85efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
①请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3788dd9c62c468e6dde658715a65b9d2.png)
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