1 . (1)问题发现:如图1,在
和
中,
,
,
,连接
,
并延长交于点F. 填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
的值为 ;
的度数为 .
(2)类比探究:如图2,在
和
中,
,
,连接
交
的延长线于点F. 请判断
的值和
的度数,并说明理由;
(3)拓展延伸:在(2)的条件下,将
绕点A在平面内旋转,
,
所在直线交于点F,若
,
,请直接写出当点D与点F重合时
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654d7550a20717faf4c079d682ba4c57.png)
![](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/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7d1a478f313c3280060ab38cc8b9e2.png)
(2)类比探究:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cab3976641d2ad9aa50a30d4c8092cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7d1a478f313c3280060ab38cc8b9e2.png)
(3)拓展延伸:在(2)的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](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/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11aba28f503a684a232490d37bcd3fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/f14515d0-3eb4-474e-b210-f96f2208fe39.png?resizew=495)
您最近一年使用:0次
2 . 如图,在矩形
中,
,点E是
边上一动点(点E不与A,D重合),连接
,以
为边在直线
的右侧作矩形
,使得矩形
矩形
交直线
于点H.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/3b6fee07-d796-416d-b1cf-91869324f9e3.png?resizew=156)
【尝试初探】
(1)在点E的运动过程中,
与
始终保持相似关系,请说明理由;
【深入探究】
(2)随着E点位置的变化,H点的位置也随之发生变化,当B,C,G共线时,连接
,求
的数量关系;
【拓展延伸】
(3)连接
,当
的长度为
时,求
的最小值(用含n和
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c2dfe278dcbb58b0c5c2cbebafab27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e279ad372652147be73c8a834734df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/879d9553767b2892b202425604fa0ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0886a467e0a6c5b9a32b99bb4639e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/3b6fee07-d796-416d-b1cf-91869324f9e3.png?resizew=156)
【尝试初探】
(1)在点E的运动过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4ce3f962c91f0d3c7b998b5fbb37b5.png)
【深入探究】
(2)随着E点位置的变化,H点的位置也随之发生变化,当B,C,G共线时,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a04ef4a57e2fc46eec19fda396cdd6.png)
【拓展延伸】
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0cf7c4cde3d35712af6dfc566929f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2023-03-13更新
|
215次组卷
|
2卷引用:四川省成都市简阳市2022-2023学年九年级下学期开学学业质量检测数学试题
名校
3 . 阅读理解:
如图1,在四边形
的边
上任取一点E(点E不与点A、点B重合),分别连接
,
,可以把四边形
分成三个三角形,如果其中有两个三角形相似,我们就把E叫做四边形
的边
上的相似点;如果这三个三角形都相似,我们就把E叫做四边形
的边
上的强相似点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/d1933a62-479c-40e1-b503-80b541c48ef2.png?resizew=593)
解决问题:
(1)如图1,
,试判断点E是否是四边形
的边
上的相似点,并说明理由;
(2)如图2在矩形
中,
,且A,B,C,D四点均在正方形网格(网格中每个小正方形的边长为1)的格点(即每个小正方形的顶点)上,试在图2中画出矩形
的边
上的一个强相似点E;
拓展探究:
(3)如图3,将矩形
沿
折叠,使点D落在
边上的点E处.若点E恰好是四边形
的边
上的一个强相似点,当
时,试求出
的值.
如图1,在四边形
![](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/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/d1933a62-479c-40e1-b503-80b541c48ef2.png?resizew=593)
解决问题:
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783ece9188b31f9b8dcedcd3ec3b2c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图2在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212e462ce05a915e685d031e32db8684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
拓展探究:
(3)如图3,将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
4 . 【观察与猜想】
(1)如图1,点
是矩形
内一点,过点
的直线
,分别交矩形的边为点
.若
,则
______;
【类比探究】
(2)如图2,在平行四边形
中,点
分别在边
上,连接
与
交于点
.求证:
;
【拓展延伸】
(3)如图3,在四边形
中,
,
在边
上,连接
与
交于点
,当
时,求
的值.
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](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/44b0e8d6874ca0163575176a49accf45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fab542c9358d2256f482066a50ec674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32672aa4900a994c7c812dfc74ef1e45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2b3247afa684b10c8e1da99cf33d5b.png)
【类比探究】
(2)如图2,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e55ab3f372d8b5034677bd779b4218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4515e1dff9a852b3294dc1d6488a5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f303f08c73f05991f79095160dfe30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de7b55161ecadf3c2172a74cd48bd0b.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/5d91cc5f25788922663a87fa5ca9fe7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da923ec4f440dfd368a94cd822beb58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e5a3686345cde38f6832b9c686f37ef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/52263a67-e61d-42e6-a2f6-23988a8fa1dd.png?resizew=410)
您最近一年使用:0次
2024-02-18更新
|
106次组卷
|
2卷引用:四川省成都市都江堰市2023-2024学年九年级上学期期末数学试题
5 . 问题提出:如图
,在
中,
,
,
,点
为
中点,
在边
上,沿着
折叠使
刚好落在边
上,落点为点
.那么随着
的变化,点
的位置是否发生变化呢?让我们来进行探索.
【初步感知】
(
)我们先来探究点
的位置,先将问题特殊化.如图
,当
时,求出
的值;
【深入探究】
(
)再探究一般情形.如图
,请证明(
)中的结论仍然成立,并求出
的值(结果用含
的代数式表示);
【拓展运用】
(
)如图
,当
时,请直接写出
的值.
![](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/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ee7149bd58649b5c8b84439e118e53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714c979d980d5377a6cc93a452bffe8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
【初步感知】
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915a3686bd9b0e04223907bf56e89ba.png)
【深入探究】
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c2cadb2f9ef2be808ce50cba73c61c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
【拓展运用】
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/510fde27b1c444eab9b8c8fbb17a3745.png)
您最近一年使用:0次
2024-02-05更新
|
191次组卷
|
4卷引用:四川省成都市经开区2023-2024学年九年级上学期期末数学试题
6 . 如图,在矩形
中,
,将线段
绕点A逆时针旋转
度
得到线段
,过点
作
的垂线交射线
于点
,交射线
于点
.
在
延长线上运动时,
与
始终相等,且
与
始终相似,请说明理由;
(2)[深入探究]若
,随着线段
的旋转,点
的位置也随之发生变化,当
时,求
的值;
(3)[拓展延伸]连接
,当
为等腰三角形时,求
的值(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f6759a981878dbedf3abdbed1cf0bec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/948375537bc44877c09fdcd64cd1d633.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ea8be9535f942121f6f6d873d03272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21786fe6fbbd671ba5158f4a920b8884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b620caad4623b952774f941cf4ca664.png)
(2)[深入探究]若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a2a34b4317deffa40ba34e269c2b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a723c4429be134cbdbf50b35c67dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(3)[拓展延伸]连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6ca93d868b56ce9e2f752ec264eabb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2023-05-04更新
|
253次组卷
|
3卷引用:2023年四川省成都市武侯区成都西川中学中考二模数学试题
名校
7 . 探究完成以下问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/0c17621b-a285-4d29-8f7a-fe770fb0eb40.png?resizew=501)
【初步认识】(1)如图1,在四边形
中,
,连接
,过点A作.
,交
的延长线于点E.求证:
;
【特例研究】(2)如图2,若四边形
中,
,(1)中的其它条件不变,取
的中点M,F,连接
.
①求证:
;
②N为
的中点,连接
,猜想
与
的位置关系,并证明你的猜想;
【拓展应用】(3)如图3,在矩形
中,对角线
相交于点O,E是射线
上一动点,过点O作
,交射线
于点F,当
,
,
时,请求出
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/13/0c17621b-a285-4d29-8f7a-fe770fb0eb40.png?resizew=501)
【初步认识】(1)如图1,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea542c31170157c0e9b9e8b65a95437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90f282c768c4178b7bb0b769dc11497f.png)
【特例研究】(2)如图2,若四边形
![](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/e9d7063a599e75a0caff1019fcf9eb85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d90fcc742bc0b6dbe2824cec9c9ea097.png)
②N为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
【拓展应用】(3)如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2eaf2acb7e954cc0c4aacdc1f29f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14df36d39d07256d631f52e6a65375b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
名校
8 . 【问题背景】如图1,在矩形
中,点M,N分别在边
,
上,且
,连接
,点P在
上,连接
并延长至点Q,使
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/20/435e8a25-a441-4af4-91b6-fd457b0a2131.png?resizew=357)
【尝试初探】求证:
;
【深入探究】若
,
,点P为
中点,连接
,
,求证:
;
【拓展延伸】如图2,在正方形
中,点P为对角线
上一点,连接
并延长至点Q,使
,连接
,若
,求
的值(用含n的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/da35c4cb923d2b640c2877291b045e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5593c5420f7d0b26dc5418b7fd2cbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/20/435e8a25-a441-4af4-91b6-fd457b0a2131.png?resizew=357)
【尝试初探】求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec9189b9a35b596eb6b08ac21834f9ca.png)
【深入探究】若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e38ac552c0789f4357f370c996692daf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94f16d5ed858699bfea5039a7bf8ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0238230198605ea45bf35d47108c1d6f.png)
【拓展延伸】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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/136eae8dcafa596d1362b6559b783a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8930997cfe2ae500106bbc147a3b950e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/747978ec67fee6ee9eb07d02b80987d7.png)
您最近一年使用:0次
2023-01-16更新
|
640次组卷
|
8卷引用:四川省成都市锦江区2022-2023学年九年级上学期期末数学试题
四川省成都市锦江区2022-2023学年九年级上学期期末数学试题2023年四川省成都市锦江区九年级一诊数学试题(已下线)2023年四川省成都市青羊区一诊数学试题变式题21-26题(已下线)2023年成都一模(几何综合)四川省成都市成都武侯外国语学校2023-2024学年九年级上学期12月月考数学试题(已下线)难点05 相似三角形综合(与三角形综合,与四边形综合)-2024年中考数学【热点·重点·难点】专练(四川成都专用)浙江省宁波市鄞州区鄞州蓝青学校2022-2023学年九年级下学期3月月考数学试题2024年河南省中考数学复习模拟试题(十)
9 . 如图①,在
中,
,
,
,点D,E分别是边
的中点,连接
,将
绕点C顺时针方向旋转,记旋转角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/fb536c5a-7b69-48f3-b2c9-b51da2678a3c.png?resizew=465)
(1)问题发现
当
时,
.
(2)拓展探究
试判断:当
时,
的大小有无变化?请仅就图②的情况给出证明.
(3)问题解决
(i)当
旋转至A、D、E三点共线时,如图③,计算
的值是多少?
(ii)根据图③的结论,请直接写出图④中,线段
的长,
_______.
![](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/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5dfc2edd439281ad211a3736f9484a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/fb536c5a-7b69-48f3-b2c9-b51da2678a3c.png?resizew=465)
(1)问题发现
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7e8c4e8015bc1a44a89460e1dc0d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce24b781c66474602b5ba6627241531.png)
(2)拓展探究
试判断:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b9fe3abff2653fc00ca4e98901169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625000a942ec1b76a1176284be6d6520.png)
(3)问题解决
(i)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(ii)根据图③的结论,请直接写出图④中,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
您最近一年使用:0次
名校
10 . 【阅读感悟】数学解题的一个重要原则是对一个数学问题,改变它的形式,变换它的结构,直到发现有价值的东西.知识与方法上的类比是探索发展的重要途径,是发现新问题、新结论的重要方法.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/1d80a8ec-261a-479f-b344-7955983541a4.png?resizew=613)
【知识方法】
(1)如图1,在
与
中,
,连接
、
,则
与
的数量关系是______;
【类比迁移】
(2)如图2,正方形
与正方形
共用点D,连接
、
,试探究
、
之间的数量关系,并说明理由:
(3)如图3,在
与
是等边三角形,
可以绕点C旋转,连接
、
、
.若
,当四边形
是平行四边形时,则线段
的长是_______;
【拓展应用】
(4)如图4,点P是矩形
边
上的动点,连接
,将
绕点P顺时针旋转
至
,
交
于点G,将
绕点P顺时针旋转
至
,连接
、
、
、若
,求四边形
面积的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/1d80a8ec-261a-479f-b344-7955983541a4.png?resizew=613)
【知识方法】
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31051b6cde509e461102f6d06face12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/d40b319212a7e7528b053e1c7097e966.png)
【类比迁移】
(2)如图2,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【拓展应用】
(4)如图4,点P是矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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