如图,
中,
,动点
从点
出发,在
边上以每秒
的速度向点
匀速运动,同时动点
从点
出发,在
边上以每秒
的速度向点
匀速运动,运动时间为
秒
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/19/54840ee4-d1ce-495e-b08b-4c3594e111f1.png?resizew=310)
(1)是否存在某一时刻
,使
的面积是
面积的
?若存在求出相应的
值,若不存在,
请说明理由.
(2)在运动过程中,是否存在某一时刻
,使
是等腰三角形?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b2d17dd85c13ed60489b4cb386375b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78d0ab561d0c9bb9099772c596af8bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577fb839669e9b32c0aa4b2a32335d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/19/54840ee4-d1ce-495e-b08b-4c3594e111f1.png?resizew=310)
(1)是否存在某一时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2b58424e893df4e01c912f87e09095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d41840af35e218a5639a2eff4d80b54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(2)在运动过程中,是否存在某一时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2b58424e893df4e01c912f87e09095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
更新时间:2024-03-19 16:18:06
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【推荐2】解方程:
(1)x2﹣7x﹣18=0
(2)(2x﹣3)2﹣2(2x﹣3)﹣3=0.
(1)x2﹣7x﹣18=0
(2)(2x﹣3)2﹣2(2x﹣3)﹣3=0.
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【推荐1】综合运用
中,
为
边上一点,连结
,过点
作
交
于点
.易证:
.(不需要证明)
(2)如图②,在矩形
中,
为
边上一点,连结
,过点
作
交
于点
.
①求证:
.
②若
,
,
为
的中点,求
的长.
(3)如图③,在
中,
,
,
,
为
边上一点(点
不与点
、
重合),连结
,过点
作
交
于点
,当
为等腰三用形时,
的长为多少?
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f0805cc7a96c866df10b667ac4851e.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/67920a881de63151b9a925f05a6841ee.png)
(2)如图②,在矩形
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f0805cc7a96c866df10b667ac4851e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67920a881de63151b9a925f05a6841ee.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.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/274cf35acb4a1748d15c39d15a9bea7b.png)
(3)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02816311aebc9c6c4e110d595ce1b037.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/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐2】如图,在
中,AB=AC,AD是BC边上的中线,AC 的垂直平分线分别交AC、AD、AB于点E、O、F,连接OB,OC.
(1)求证:点O在AB的垂直平分线上;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求证:点O在AB的垂直平分线上;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85d54c7984435f2f306baac99f5dd69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/843adec8fba1741ccb81a9017cfb815f.png)
![](https://img.xkw.com/dksih/QBM/2021/4/25/2707301463212032/2710371217571840/STEM/507c6b08938f449a980d3b5a7b2af428.png?resizew=161)
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【推荐1】如图,四边形ABCD中,AB=DC,AD=BC,AD⊥CD,点E在对角线CA的延长线上,连接BD,BE.
![](https://img.xkw.com/dksih/QBM/2020/7/19/2509001984360448/2509501194731520/STEM/8dcbd56d3151489ba39d9b654b221dc7.png?resizew=185)
(1)求证:AC=BD;
(2)若BC=2,BE=6,∠ABE=30°,求EC的长.
![](https://img.xkw.com/dksih/QBM/2020/7/19/2509001984360448/2509501194731520/STEM/8dcbd56d3151489ba39d9b654b221dc7.png?resizew=185)
(1)求证:AC=BD;
(2)若BC=2,BE=6,∠ABE=30°,求EC的长.
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【推荐2】我们引入如下概念,
定义;到三角形的两条边的距离相等的点,叫做此三角形的准内心,举例:如图1,
,若
,PD⊥AC,则P为
的准内心
![](https://img.xkw.com/dksih/QBM/2021/3/31/2689575754317824/2689634265079808/STEM/15bc800d-4ad3-475f-a837-75df2f11bc6f.png?resizew=633)
(1)填空;根据准内心的概念,图1中的点P在
的________上.
(2)应用;如图2,
中,
,
,准内心P在
上,求P到
边的距离
的长.
(3)探究;已知
为直角三角形,
,
,准内心P在
的边上,试探究
的长.
定义;到三角形的两条边的距离相等的点,叫做此三角形的准内心,举例:如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30bfc6b5683ec1919f8257765ce056b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2021/3/31/2689575754317824/2689634265079808/STEM/15bc800d-4ad3-475f-a837-75df2f11bc6f.png?resizew=633)
(1)填空;根据准内心的概念,图1中的点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(2)应用;如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64895c7c01ee38b55919a47877e45d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.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/e0629ce42392a7fe9be21d25c39c3e64.png)
(3)探究;已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d30f9b7a6123f13fa0793ead76dc651a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
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【推荐3】如图1,
ABC中,AC=BC=4,∠ACB=90°,过点C任作一条直线CD,将线段BC沿直线CD翻折得线段CE,直线AE交直线CD于点F.直线BE交直线CD于G点.
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897003517845504/2897262667325440/STEM/0e26be5e-a4bc-4c2e-bb2b-c26a6f43d2be.png?resizew=691)
(1)小智同学通过思考推得当点E在AB上方时,∠AEB的角度是不变的,请按小智的思路帮助小智完成以下推理过程:
∵AC=BC=EC,
∴A、B、E三点在以C为圆心以AC为半径的圆上,
∴∠AEB= ∠ACB,(填写数量关系)
∴∠AEB= °.
(2)如图2,连接BF,求证A、B、F、C四点共圆;
(3)线段AE最大值为 ,若取BC的中点M,则线段MF的最小值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897003517845504/2897262667325440/STEM/0e26be5e-a4bc-4c2e-bb2b-c26a6f43d2be.png?resizew=691)
(1)小智同学通过思考推得当点E在AB上方时,∠AEB的角度是不变的,请按小智的思路帮助小智完成以下推理过程:
∵AC=BC=EC,
∴A、B、E三点在以C为圆心以AC为半径的圆上,
∴∠AEB= ∠ACB,(填写数量关系)
∴∠AEB= °.
(2)如图2,连接BF,求证A、B、F、C四点共圆;
(3)线段AE最大值为 ,若取BC的中点M,则线段MF的最小值为 .
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【推荐1】如图,在正方形
中,
、
分别是边
、
上的点,且
,
,连接
并延长交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/6c68b0aa-474f-4e2b-aebf-e26cdcdec05e.png?resizew=197)
(1)求证:
∽
;
(2)若正方形的边长为
,求
的长.
![](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/a0ed1ec316bc54c37c4286c208f55667.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/f0a3ae16e3f4a6b8994eb716f8502ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d030b3dac667c00da2e2b88b8af9ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/6c68b0aa-474f-4e2b-aebf-e26cdcdec05e.png?resizew=197)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)若正方形的边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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【推荐2】如图①,直线PQ同侧有两点M,N,点T在直线PQ上,若∠MTP=∠NTQ,则称点T为M,N在直线PQ上的投射点.
(1)如图②,在Rt△ABC中,∠B=60°,D为斜边AB的中点,E为AC的中点.求证:点D为C,E在直线AB上的投射点;
(2)如图③,在正方形网格中,已知点A,B,C三点均在格点上,请仅用没有刻度的直尺在AC上画出点P,在BC上画出点Q,使A,P在BC上的投射点Q满足CQ=2BQ;
(3)如图④,在Rt△ABC中,∠C=90°,AC=BC,在AB,BC边上是否分别存在点D,E,使点D为E,C在AB上的投射点,点E为A,D在BC上的投射点?若存在,求出
的值;若不存在,请说明理由.
(1)如图②,在Rt△ABC中,∠B=60°,D为斜边AB的中点,E为AC的中点.求证:点D为C,E在直线AB上的投射点;
(2)如图③,在正方形网格中,已知点A,B,C三点均在格点上,请仅用没有刻度的直尺在AC上画出点P,在BC上画出点Q,使A,P在BC上的投射点Q满足CQ=2BQ;
(3)如图④,在Rt△ABC中,∠C=90°,AC=BC,在AB,BC边上是否分别存在点D,E,使点D为E,C在AB上的投射点,点E为A,D在BC上的投射点?若存在,求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe5cf6513259979c26d6659fbcf40b21.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/6/77738b7a-5143-4f27-a84b-ab5d0326c9aa.jpg?resizew=596)
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