1 . 如图1,点G在正方形
的对角线
上,
于E,
于F.
①求证:四边形
是正方形;
②推断:
___________;
(2)探究与证明:
将正方形
绕点C顺时针方向旋转
角(
),如图2,试探究线段
与
之间的数量关系,并说明理由;
(3)拓展与运用:
正方形
在旋转过程中,当B、E、F三点在一条直线上时,如图3,延长
交
于点H,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ddc47cce2e80eefc150192061c3b70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fe55d17f5ca49389dd2cb1ab74ac2b.png)
①求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
②推断:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2367bb0d178d899c659757872c086a4e.png)
(2)探究与证明:
将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6406b4f25d9175b1a1bd9c739cb740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)拓展与运用:
正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3da257beb296514b57a1e3169b099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04d5161a60846b450881b5104b177a7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
2022-12-13更新
|
126次组卷
|
3卷引用:山东省济南市长清区2023-2024学年九年级上学期期中数学试题
2 . 如图1,在
和
中,
,
,点D是线段
上一动点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/68a59d06-8c33-40b7-b6b2-6362679d4678.png?resizew=451)
(1)填空:①
的值为 ;②
的度数为 .
(2)类比探究:如图2,在
和
中,
,
,点D是线段
上一动点,连接
.请求出的
值及
的度数,并说明理由.
(3)拓展延伸:如图3,在
和
中,
,
,点D是线段
上一动点,连接
,P为
中点.若
,
,在点D从A点运动到B点的过程中,请直接写出点P经过的路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a356ae65ad2cccdd27189efcea2da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/68a59d06-8c33-40b7-b6b2-6362679d4678.png?resizew=451)
(1)填空:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4907f159ff9c4caacf266db591588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
(2)类比探究:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17df03e1b7418a84e8f8a3d512b2c1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4907f159ff9c4caacf266db591588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
(3)拓展延伸:如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a1f8d275052c7fcb675e32f86d44d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
您最近一年使用:0次
2023-02-28更新
|
245次组卷
|
3卷引用:山东省济南市东南片区2022-2023学年九年级上学期期末考试数学试题
山东省济南市东南片区2022-2023学年九年级上学期期末考试数学试题山东省济南市历城区2022-2023学年九年级上学期期末数学试题(已下线)2023年山东省济南市长清区东城校际联合体中考二模数学试题变式题21-26题
3 . 综合与实践
【问题发现】
(1)如图1,在正方形
中,点E,F,G,H分别在边
,
,
,
上,且
于点O.试猜想线段
与
的数量关系为__________;
(2)如图2,在矩形
中,
,
,点E,F,G,H分别在边
,
,
,
上,连接
,
,且
,垂足为O.试写出线段
与
的数量关系,并说明理由;
(3)如图3,在四边形
中,
,
,点M,N分别在边
,
上,连接
,
,且
,垂足为O.已知
,
,若点M为
的三等分点,直接写出线段
的长.
【问题发现】
(1)如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846b1b49f05812b0761eb565062d32f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04730ed5e8918d21339c2df7924667e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846b1b49f05812b0761eb565062d32f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6fa16ec052130efba685c691450f3eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ce2116be8fde8c3eee616f18f2e272d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
您最近一年使用:0次
2023-07-02更新
|
442次组卷
|
6卷引用:2024年山东省枣庄市滕州市九年级第一次模拟数学模拟试题
名校
4 . 综合与实践
问题情境:如图,在
中,
,将
绕点B顺时针旋转得到
,连接
,连接
并延长交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/7caa4125-828c-43a8-8683-b31471481eb7.png?resizew=190)
猜想验证:
(1)试猜想
与
是否相似?并证明你的猜想.
探究证明:
(2)如图,连接
交
于点H,
与
相交于点G,
是否成立?并说明理由.
拓展延伸:
(3)若
,直接写出
的值.
问题情境:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d2a15061b3f15f299a1c9c1ba66084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/7caa4125-828c-43a8-8683-b31471481eb7.png?resizew=190)
猜想验证:
(1)试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
探究证明:
(2)如图,连接
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd09b3d36ae057ff9651d64ed1c1e74.png)
拓展延伸:
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9351d4fe3184f8c2d8797528562433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5509269c540ac83ba34d2e8a31242903.png)
您最近一年使用:0次
2022-12-05更新
|
155次组卷
|
6卷引用:山东省菏泽市牡丹区第二十二初级中学2022-2023学年九年级上学期11月月考数学试题
5 . (1)【问题呈现】如图1,在
中,
,在
上取点D,过点D作
的垂线
交
于点E.若
,求
的值;
(2)【类比探究】在(1)的条件下,
绕点A逆时针旋转一定角度(点E在
的内部),如图2,连接
,求
的值;
(3)【拓展提升】在(2)的条件下,延长
交
于点F,交
于点G,如图3,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5375a13554748f2bb665298c9b325411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea79586df2029edb34c7cb2f67dc3722.png)
(2)【类比探究】在(1)的条件下,
![](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/8518c9bd112f86afb26eec99b01934d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
(3)【拓展提升】在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008a13558fdf96dc45178a6e49a94399.png)
![](https://img.xkw.com/dksih/QBM/2023/6/10/3256456209620992/3262923937685504/STEM/a6197432ec7547e09f0ee1c3e1cf8995.png?resizew=479)
您最近一年使用:0次
2023-06-19更新
|
110次组卷
|
4卷引用:山东省菏泽市定陶区2023-2024学年九年级上学期期末考试数学试题
名校
6 . 【温故知新】(1)九(I)班数学兴趣小组认真探究了课本P91第13题:如图1,在正方形
中,E是
的中点,F是
上一点,且
,图中有哪几对相似三角形?把它们表示出来,并说明理由.
①小华很快找出
,他的思路为:设正方形的边长
,则
,
,利用“两边分别成比例且夹角相等的两个三角形相似”即可证明,请你结合小华的思路写出证明过程;
②小丽发现图中的相似三角形共有三对,而且可以借助于
与
中的比例线段来证明
与它们都相似.请你根据小丽的发现证明其中的另一对三角形相似;
【拓展创新】
(2)如图2,在矩形
中,E为
的中点,
交
于F,连结
.(
) 求证:
.
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d98494fafd5f4e2f189fa300369cf8.png)
①小华很快找出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859cc0374ea0736be7c716499d870b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2df9dccdd6307407833d2d928d29a2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c00ea15b9f65461a46ca73aa52dac25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1cf3a1e6eaaa864cd72d1aa4064a2a4.png)
②小丽发现图中的相似三角形共有三对,而且可以借助于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9966839944bf4087bd18fede1d2d2c42.png)
【拓展创新】
(2)如图2,在矩形
![](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/e0133c119bdff050752f8912a4ace330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b929f23a27df44b578b9efa330a775dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42955f9dade815d37a0cbd17bd7c7760.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/335e1aef-7162-4e52-83ab-b80a27f427db.png?resizew=299)
您最近一年使用:0次
解题方法
7 . 【证明体验】
(1)如图1,
为
的角平分线,
,点
在线段
上,
,求证:
平分
;
【思考探究】
(2)如图2,在(1)的条件下,
为
上一点,连接
交
于点
.若
,
求证:
;
【拓展延伸】
(3)如图3,在四边形
中,对角线
平分
,
,点
在
上,
,若
,
,
,求
的长.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.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/934a9508c176f44bf58f88715bd98f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
【思考探究】
(2)如图2,在(1)的条件下,
![](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/735056c174e8dd7906257a2a50a962a7.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/c07b92b8282c7fd1158b3b5098e38c39.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5806af51d771edb73fd4074efbb237.png)
【拓展延伸】
(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c92623dd83babb7109b74e9a1e5e162.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/37e7f77002150b48a66963c0a9394e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19d8b64ae5ebb831b1d03316e89f4aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc91db43eea9ba6f29cb5719e26fa34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/14/347c56d6-2150-4f84-9454-605a5f85565f.png?resizew=402)
您最近一年使用:0次
2023-10-13更新
|
465次组卷
|
7卷引用:山东省济宁市邹城市第十一中学2023-2024 学年九年级下学期第一次月考数学试题
山东省济宁市邹城市第十一中学2023-2024 学年九年级下学期第一次月考数学试题2022年安徽省全椒县中考第二次模拟考试数学试题2022年安徽省滁州市定远县中考二模数学试题(已下线)专题23.8 图形的相似章末拔尖卷-2023-2024学年九年级数学上册举一反三系列(华东师大版)(已下线)专题22.8 相似形章末拔尖卷-2023-2024学年九年级数学上册举一反三系列(沪科版)(已下线)专题4.8 图形的相似章末拔尖卷-2023-2024学年九年级数学上册举一反三系列(北师大版)(已下线)专题4.8 相似三角形章末拔尖卷-2023-2024学年九年级数学上册举一反三系列(浙教版)
名校
8 . 数学思想方法作为数学学科的一般原理,在数学学习中至关重要.我们经常运用类比,转化,从特殊到一般等思想方法来解决一些数学问题.
如图①,在平行四边形
中,点
是
边的中点,点
是线段
上一点,
的延长线交
于点
.若
,求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/cf0b78d5-b708-4fdd-a8f8-3ffe87a2d355.png?resizew=118)
【尝试探究】
在图①中,过点
作
交
于点
,则
的值为____,
的值为__,
的值为____.
【类比延伸】
如图②,在原题的条件下,若
,则
的值为____(用含
的代数式表示).
【拓展迁移】
如图③,若点
在线段
的延长线上,
的延长线交
的延长线于点
,
,则
的值为____(用含
的代数式表示).
如图①,在平行四边形
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.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/10c0894e2754e8447a3e7eac6c69c42f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f803c907aa8d31a9359f24405990fc92.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/b68e9116-4c23-4585-b26d-001c755cb8f4.png?resizew=109)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/30c7a779-fd74-4235-a7d1-78f7dfc7bdb3.png?resizew=124)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/cf0b78d5-b708-4fdd-a8f8-3ffe87a2d355.png?resizew=118)
【尝试探究】
在图①中,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a0ef3300ad544912096e434828c40c2.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/c0fa4fefafdb5d8c47e0ffd79a1accbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe67c3796f53da2fbe20fbe34410976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f803c907aa8d31a9359f24405990fc92.png)
【类比延伸】
如图②,在原题的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c82a17bd540fb56237e418de19936d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f803c907aa8d31a9359f24405990fc92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
【拓展迁移】
如图③,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fde57e86a7bb5b301e4e41ac1ccd6ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f803c907aa8d31a9359f24405990fc92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2022-11-12更新
|
317次组卷
|
4卷引用:山东省青岛市黄岛区、胶州市、平度市、西海岸新区2022-2023学年九年级上学期期中数学试题
9 . 综合与实践
问题情境:综合与实践课上,老师让同学们以“矩形纸片的折叠”为主题开展数学活动.老师给同学准备了一些
纸,已知
纸的长宽之比为
.
操作探究:如图1,将
纸
沿过点A的直线折叠,使点D的对应点
落在边
上展开后折痕
交
于点E.
(1)
的度数;
(2)求证:
.
(3)拓展延伸:如图2,在图1的基础上,继续沿过点A的直线折叠,使点B的对应点
落在
上,展开后折痕交
于点F,连接
.请判断
的形状并说明理由.
问题情境:综合与实践课上,老师让同学们以“矩形纸片的折叠”为主题开展数学活动.老师给同学准备了一些
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59974423718d2ab74c5c351653d48ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59974423718d2ab74c5c351653d48ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d76e86c1dcc191aa8d51b3a528a454d.png)
操作探究:如图1,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59974423718d2ab74c5c351653d48ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/12/d94ce422-2c55-4bd7-89ef-a7cf4c53f4cf.png?resizew=339)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466abad3325095407ca1dff1f3313ed3.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322099528bf897d82489bd67b24c0a53.png)
(3)拓展延伸:如图2,在图1的基础上,继续沿过点A的直线折叠,使点B的对应点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
您最近一年使用:0次
2023-05-27更新
|
189次组卷
|
2卷引用:2023年山东省临沂市沂水县中考二模数学试题
10 . 问题提出:已知矩形
,点
为
上的一点,
,交
于点
.将
绕点
顺时针旋转
得到
,则
与
有怎样的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/7780162d-fd46-4d3c-affa-73794be6ea7a.png?resizew=396)
问题探究
(1)探究一:如图,已知正方形
,点
为
上的一点,
,交
于点
.
①如图1,直接写出
的值 ;
②将
绕点
顺时针旋转到如图2所示的位置,连接
、
,猜想
与
的数量关系,并证明你的结论;
(2)探究二:如图,已知矩形
,点
为
上的一点,
,交
于点
.如图3,若四边形
为矩形,
,将
绕点
顺时针旋转
得到△
、
的对应点分别为
、
点),连接
、
,则
的值是否随着
的变化而变化.若变化,请说明变化情况;若不变,请求出
的值.
(3)一般规律
如图3,若四边形
为矩形,
,其它条件都不变,将
绕点
顺时针旋转
得到△
,连接
,
,请直接写出
与
的数量关系.
(4)问题解决
如图4,当
时,其他条件不变,
绕点
顺时针旋转,设旋转角为
,当
时,写出此时
.
(5)拓展延伸
如图5,点
是正方形
对角线
上一点,连接
,过点
作
,交线段
于点
,交线段
于点
,连接
交线段
于点
.给出下列四个结论,①
;②
;③
;④
;
正确的结论有 个.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9966839944bf4087bd18fede1d2d2c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b40aa8d2482d698ebef69cf225f99f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/496c8a4cf565eda9e9a107e216fd93e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72346f06fc80c323b6d11cbbe4db6a56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/7780162d-fd46-4d3c-affa-73794be6ea7a.png?resizew=396)
问题探究
(1)探究一:如图,已知正方形
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①如图1,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ffa85c34fdc3f25143ec84888ff2d25.png)
②将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9966839944bf4087bd18fede1d2d2c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)探究二:如图,已知矩形
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/b1e418a43f907cc832b5542b054e5cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29b86dcb70c161cd212f18fdc2e1e18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd66409de376afe0135462a221c08ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72124afe6bc0ae5db3ee4e706649ca0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72346f06fc80c323b6d11cbbe4db6a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/424f0409d85b5f85162e3c17b1daebfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/424f0409d85b5f85162e3c17b1daebfc.png)
(3)一般规律
如图3,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3e9dca69a8e35a624024e392379a995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29b86dcb70c161cd212f18fdc2e1e18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b40aa8d2482d698ebef69cf225f99f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda32513cc5c012efdfde596549dbe43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72346f06fc80c323b6d11cbbe4db6a56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bf97f9082d7f40bc680cc2c58865309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72346f06fc80c323b6d11cbbe4db6a56.png)
(4)问题解决
如图4,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a26c2c53046cbfe83f84f5393373589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29b86dcb70c161cd212f18fdc2e1e18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813472fe85905302843cb3aadec9c8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a5594708b3d94026c639aff4446b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
(5)拓展延伸
如图5,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a19339adac3a2f1aab1fbc11b1c68.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e43ba3d22771e5000e3df8fd4a42df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7db8451244b625f7bed403b5eacd854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6df3e35040f838c5007ed1fdd0519f1.png)
正确的结论有 个.
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