综合与实践
问题情境:综合实践课上,老师让同学们以正方形为背景,添加适当的几何元素后,探究线段之间的数量关系.如图1,已知四边形
是正方形,点
在线段
上
,以
为边作正方形
,使点
在线段
上.延长
至点
,使
,连接
.
①求证:
;
②猜想线段
与
之间的数量关系,直接写出结论;
深入探究:(2)奋进小组将正方形
从图1中位置开始,绕点
逆时针旋转(设点
的对应点为
),提出如下问题,请你解答:
①如图2,当点
恰好落到线段
上时,连接
.猜想此时线段
与
之间的数量关系,并说明理由;
②若
,在正方形
旋转过程中,直接写出
三点在同一直线上时线段
的长.
问题情境:综合实践课上,老师让同学们以正方形为背景,添加适当的几何元素后,探究线段之间的数量关系.如图1,已知四边形
![](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/16d8bea84fa8846a4ceb16de63eb678c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3270db2b36dfb7b7ba5684a6ca4b8b2.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/656520f673b5ee3095e16bd1af4c263b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ece0140462cac244485f6246d3660e01.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e27598c2536cc94e48b5e65ca189ae66.png)
②猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
深入探究:(2)奋进小组将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
①如图2,当点
![](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/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55063c9edacc890aa072fde5b53809d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d33855232be729b0de24d9fb231e945.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
2024·山西太原·一模 查看更多[1]
更新时间:2024-04-21 10:01:51
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相似题推荐
解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐1】等边
的两边
、
所在直线上分别有两点M、N,D为
外一点,且
,
,
.当点M、N分别在直线
、
上移动时,探究
之间的数量关系以及
的周长Q与等边
的周长L的关系.
(1)如图①,当点M、N在边
、
上,且
时,
之间的数量关系式为______;此时
的值是______;
(2)如图②,当点M、N在边
、
上,且
时,猜想(1)问的两个结论还成立吗?写出你的猜想并加以证明;
(3)如图③,当点M、N分别在边
、
的延长线上时,若
,试用含x、L的代数式表示Q.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9149c116c750a53b286e543391503fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf905f3910d9238a44ef647835b3d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e3c9781247e30f6aa92c622c047b58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/90f61cf7-49c6-46b9-a687-1cfbb70820c8.png?resizew=435)
(1)如图①,当点M、N在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e395831eddeca6f5ae769b2dfa2b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e3c9781247e30f6aa92c622c047b58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e182aaf6f70c87eb637d600eb39a9de7.png)
(2)如图②,当点M、N在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/266a4fc22480b9283a9288599d13a3ad.png)
(3)如图③,当点M、N分别在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd7ea6f8961197129f7660d65dd487f9.png)
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
名校
【推荐2】如图,在矩形
中,
,
,点E为
中点,连接
,点F为
中点,点G为线段
上一点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/c9a31b63-5886-4638-bfa3-1647d5136a59.png?resizew=507)
(1)如图1,若点G为
中点,求证:四边形
为平行四边形;
(2)如图2,若点G使得
,求四边形
的面积;
(3)如图3,连接
,若点G使得
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/984ec72f6892e4363dcafa453c513217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a189925db18ea4697ce85a0ee5f0c82a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/4/c9a31b63-5886-4638-bfa3-1647d5136a59.png?resizew=507)
(1)如图1,若点G为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ea8aac2c3897d192cda5ba3d59a15fa.png)
(2)如图2,若点G使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f2bb4f2f334eb4ad4caf244aa462b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ea8aac2c3897d192cda5ba3d59a15fa.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19665c8447a78202cc6a3edc0b9875ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】原题呈现:
如图1: 在
和
中,
点
为
内部一点,射线
交直线
于点
.试探究:
,
,
之间存在怎样的数量关系![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bbee662e242611afdbdae4b8a36a7c.png)
问题探究:
(1)先将问题特殊化如图(2),当点
,
重合时,直接写出一个等式,表示
,
,
之间的数量关系;
,
不重合时(1)中的结论仍然成立.
拓展延申:
(3)如图3,若将原题中的条件“
”改为
(
是常数),请写出一个等式,表示线段
,
,
之间的数量关系.
如图1: 在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f194961f508cd8393eeb241784548519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c89c94f2a85017e2f6a48de147a32d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bbee662e242611afdbdae4b8a36a7c.png)
问题探究:
(1)先将问题特殊化如图(2),当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
拓展延申:
(3)如图3,若将原题中的条件“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c84a76b3012bc13b133671704422cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86243dabd6ab4f2a4e90c3a85c698949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](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/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】自定义:在一个图形上画一条直线,若这条直线既平分该图形的面积,又平分该图形的周长,我们称这条直线为这个图形的“等分积周线”.
(1)如图
,已知
,
,过点
能否画出
的一条“等分积周线”?若能,说出确定的方法,若不能,请说明理由.
(2)如图
,在四边形
中,
,
垂直平分
,垂足为
,交
于点
,已知
,
,
.求证:直线
为四边形
的“等分积周线”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/81dc1716-a20a-4685-8ce5-5af466e256c3.png?resizew=287)
(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/e746bce74c14b20d09f924f2c0446774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d8397018b0a01a1b4e9574604f9e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
【推荐1】【问题背景】
如图,点
是等边
内一点,
,求
的度数.
【方法探索】
小丽通过分析、思考,形成如下思路:
思路一:将
绕点
逆时针旋转
,得到
,连接
,从而求出
的度数;
思路二:将
绕点
顺时针旋转
,得到
,连接
,从而求出
的度数.
······
下面是某位同学的解题,请你完成后续解题过程;
解:把
绕着点
逆时针旋转
得到
,连接
.
请接着写下去:
【类比探究】
如图,若点
是正方形
内一点,
,直接写出
__﹔
如图,点
在正方形
的对角线
上,且满足
直接写出线段
间的数量关系为_ ;
【拓展延伸】
如图,在四边形
中,
,过点
作
,连接
,问线段
是否存在最小值?若存在,请求出最小值.若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce066003c0a1f0879cbca2f32802e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e497eafaa23baf01e45d9f8eb26a23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
【方法探索】
小丽通过分析、思考,形成如下思路:
思路一:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db93a66331256cbfe5f4937e71134c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
思路二:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8515a246fbc25b0d99ac1c7ff9659c56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
······
下面是某位同学的解题,请你完成后续解题过程;
解:把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db93a66331256cbfe5f4937e71134c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99e1ad0d6fb0f13be56d09086366c5.png)
请接着写下去:
【类比探究】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce066003c0a1f0879cbca2f32802e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a766050197ed5a044a132c29a98539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e7d551cca653e2d638c8cab4c2fda8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](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/eea55cd40ddd635b5417ac91a0eb4e99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/190719a6d1e832830dcaeb66a2a2ff82.png)
【拓展延伸】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b49be5fb800b66cdb284b864e8f04a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d57ff70aa643534351f74623162f74c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93601c08d4a9a96576fc094b601dee4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/f91b1c51-f959-475a-b425-41c91202b01f.png?resizew=581)
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【推荐2】(1)如图1,已知正方形
在直线
的上方,
在直线
上,
是
上一点,以
为边在直线
的上方作正方形
.
【初步探究】①
与
的关系为_______________;
【深入探究】②连接
,观察并猜测
的度数,并说明理由;
【衍生拓展】(2)如图2,将图1中的正方形
改为矩形
,
,
(
,
为常数),
是线段
上一动点(不含端点
、
),以
为边在直线
的上方作矩形
,使顶点
恰好落在射线
上.判断当点
由
向
运动时,
的大小是否总保持不变?若
的大小不变,请用含
,
的代数式表示
的值;若
的大小发生改变,请举例说明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
【初步探究】①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1167569a962ce1379ecb7d05da90140d.png)
【深入探究】②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fdec606b12046b08df46d40907bf957.png)
【衍生拓展】(2)如图2,将图1中的正方形
![](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/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a88b719166fcc1431f876bc8c5656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.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/2a30f3a8b673cc28bd90c50cf1a35281.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/3fdec606b12046b08df46d40907bf957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fdec606b12046b08df46d40907bf957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce261bec39286ec8e4599bed571f7d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fdec606b12046b08df46d40907bf957.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/b4c423d5-568c-4ca2-b57f-fc7e88c2a4c6.png?resizew=266)
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名校
【推荐1】如图,在
的内接
中,
,作
于点
,交
于另一点
是
上的一个动点(不与
重合),射线
交线段
的延长线于点
,分别连接
和
交
于点
.
;
(2)若
,
,求
的长;
(3)在点
运动过程中,当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aefd4d554b29e4c490fe294a3116268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1be642ddd61c3ad26bcbe2dc42e3512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0520e9675bc1b416e8b8f01eb69fd13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943049ea4622f0ac4844b7c35b9a6434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9d706e0bf88d58e65a473e6d0579471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8d952313bad3688e1f1127ae6abc41.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b02c51ce96d326f33c430cc884ea00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee09966649ea430fd21f7ccaa776fa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58bb9e85808c7f1b00308d5fd1bce7bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef09b378aacf309e6740779057f1841.png)
您最近一年使用:0次
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较难
(0.4)
【推荐2】定义:从三角形的一个顶点引出一条射线与对边相交,顶点与交点之间的线段把这个三角形分割成两个小三角形,如果分得的两个小三角形中有一个与原三角形相似,那么我们称这条线段为原三角形的相似线,记此小三角形与原三角形的相似比为k.
(1)【理解】如图1,△ABC中,已知D是AC边上一点,∠CBD=∠A.求证:BD是△ABC的相似线;
(2)【探究】如图2,△ABC中,AB=4,BC=2,AC=2
.请用尺规作图法在平面内找一点D、使BC是以A、D为其中两个顶点的三角形的相似线,并直接写出k的值,(提醒:保留作图痕迹,在确认无误后用黑色签字笔将作图痕迹描黑)
(3)【应用】如图3,扇形AOB中,∠AOB=90°,AO=OB=2,C,D分别是OA,OB的中点,P是弧AB上的一个动点,求PC+2PD的最小值.
(1)【理解】如图1,△ABC中,已知D是AC边上一点,∠CBD=∠A.求证:BD是△ABC的相似线;
(2)【探究】如图2,△ABC中,AB=4,BC=2,AC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
(3)【应用】如图3,扇形AOB中,∠AOB=90°,AO=OB=2,C,D分别是OA,OB的中点,P是弧AB上的一个动点,求PC+2PD的最小值.
![](https://img.xkw.com/dksih/QBM/2019/5/16/2204741797634048/2205088647389184/STEM/1961fc08e6ca4ff28fd10e5d71b60029.png?resizew=470)
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【推荐3】如图,在平面直角坐标系中,直线
与
轴、
轴分别角与A、B两点,P、Q分别是线段OB、AB上的两个动点,点P从O出发一每秒2个单位长度的速度向终点B运动,同时Q从B出发,以每秒5个单位的速度向终点A运动,当其中一点到达终点时整个运动结束,设运动时间为t秒.
(1)求出点Q的坐标(用t的代数式表示)
(2)若C为OA的中点,连接PQ、CQ,以PQ、CQ为邻边作
PQCD.
①是否存在时间t,使得坐标轴切好将
PQCD的面积分为1:5的两个部分,若存在,求出t的值;若不存在,请说明理由.
②直接写出整个运动过程中
PQCD对角线DQ的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced2deeedc8b1e9f06fe24de69a79bba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)求出点Q的坐标(用t的代数式表示)
(2)若C为OA的中点,连接PQ、CQ,以PQ、CQ为邻边作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b39fc5a793d20e1e5f87f3f7cd78c6e.png)
①是否存在时间t,使得坐标轴切好将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b39fc5a793d20e1e5f87f3f7cd78c6e.png)
②直接写出整个运动过程中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b39fc5a793d20e1e5f87f3f7cd78c6e.png)
![](https://img.xkw.com/dksih/QBM/2019/4/18/2184967514521600/2188831367274496/STEM/98a045316bf543b995243558f2a8a2ae.png?resizew=182)
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