如图,
是等边三角形,以直线
为
轴建立平面直角坐标系,若
且
、
满足
,
为
轴上一动点,以
为边作等边
,
交
轴于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/ee00156a-ee20-4719-84de-398b5e6ec939.png?resizew=500)
(1)如图
,求
点坐标;
(2)如图
,
为
正半轴上一点,
在第二象限,
的延长线交
轴于
,当
点在
轴正半轴上运动时,
点坐标是否变化,若不变,求
点的坐标,若变化,说明理由;
(3)如图
,
在
轴负半轴上,以
为边向右构造等边
,
交
轴于
点,如果
点在
轴负半轴上运动时,仍保持
为等边三角形,连
,试求
,
,
三者的数量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bcd735ddc790c918d9a93336093fb02.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/49d2e5ca57f1d1d6dcd616a2ff45c56c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/ee00156a-ee20-4719-84de-398b5e6ec939.png?resizew=500)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.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/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
更新时间:2024-01-23 08:53:52
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】通过对下面数学模型的研究学习,解决下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/32d5ec1a-b2d8-4bdf-b834-bd2ca4a1c99b.png?resizew=569)
【模型呈现】
(1)如图
,
,
,过点
作
于点
,过点
作
于点
.由
,得
.又
,可以推理得到
.进而得到
___________,
___________.我们把这个数学模型称为“
字”模型或“一线三等角”模型;
【模型应用】
(2)①如图
,
,
,
,连接
,
,且
于点
,
与直线
交于点
.求证:点
是
的中点;
②如图
,在平面直角坐标系
中,点
的坐标为
,点
为平面内任一点.若
是以
为斜边的等腰直角三角形,请直接写出点
的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/32d5ec1a-b2d8-4bdf-b834-bd2ca4a1c99b.png?resizew=569)
【模型呈现】
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d900531973c546625694146fa1509ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76223401f248186796d5198d7a90aac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8efa4e9eebe76c572fbac1522085868b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd9776aa108071b50b71adf181bbdaf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2afe3cea4abdb1b72464d8a1f92db114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
【模型应用】
(2)①如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26891f01df7816ca874413643fff81a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2ab6940dca62be1f3b2b5f8531990.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/31025539da369c563e8633f375146593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
②如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82be1703fea194fbd9a520f879e16b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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【推荐2】在平面直角坐标系中,有点
,
.
(
)当点
在第一象限的角平分线上时,
的值为__________.
(
)若线段
轴.
①求点
、
的坐标.
②若将线段
平移至线段
,点
、
分别平移至
,
,则
坐标为__________.
坐标为__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb286452e9fc284f0b89efc0eeb8e132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c5323c5ded464fafb004efeb1279414.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa16d8ca4637c8103fe3844b9338d68.png)
①求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
②若将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb82b285ab6dad4ae685bf4d42dbf883.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/d56a96763722ec89847716ff791edeba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a226381b34755c0d827608dbf35ce30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7856b843caf384fca612ce663f21c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4cfbcf4ecbca8f964985f4a2d3700ee.png)
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名校
【推荐3】如图,在平面直角坐标系中,点O(0,0),A(0,a),C(b,0)满足
+|b﹣2|=0.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/948d257d-3435-4d26-9d91-992d8b8dd5ea.png?resizew=341)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/88beeccf-51ab-4c21-a10d-578d0df6430e.png?resizew=662)
(1)直接写出A、C两点的坐标.
(2)如图1,已知坐标轴上有两动点P、Q同时从O点出发,P点沿x轴正方向以2个单位长度每秒的速度匀速移动,Q点以1个单位长度每秒的速度沿y轴正方向移动,点D(1,2)为线段AC上一点,设运动时间为t(t>0)秒.问:是否存在这样的t,使S三角形DPC=S三角形DQO,若存在,请求出t的值;若不存在,请说明理由.
(3)如图2,点G是第二象限上的点,连OG,且OG
AC,点F是线段AC上一点,满足∠AOG=∠AOF.点E是射线OA上一动点,连CE交直线OF于点H,当点E在射线OA上运动的过程中,请确定∠OHC,∠ACE和∠OEC的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8506eac81f673a9ac50a5a4eae8486f1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/948d257d-3435-4d26-9d91-992d8b8dd5ea.png?resizew=341)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/88beeccf-51ab-4c21-a10d-578d0df6430e.png?resizew=662)
(1)直接写出A、C两点的坐标.
(2)如图1,已知坐标轴上有两动点P、Q同时从O点出发,P点沿x轴正方向以2个单位长度每秒的速度匀速移动,Q点以1个单位长度每秒的速度沿y轴正方向移动,点D(1,2)为线段AC上一点,设运动时间为t(t>0)秒.问:是否存在这样的t,使S三角形DPC=S三角形DQO,若存在,请求出t的值;若不存在,请说明理由.
(3)如图2,点G是第二象限上的点,连OG,且OG
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
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名校
【推荐1】已知点
为
和
的公共顶点,将
绕点
顺时针旋转
,连接
,
,请完成如下问题:
(1)如图1,若
和
均为等边三角形,线段
与线段
的数量关系是______;
(2)类比探究:如图2,若
,
,其他条件不变,请写出线段
与线段
的数量关系,并说明理由;
(3)拓展应用:如图3,
是
内一点,
,
,
,
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335c1d4db7d83b1271c2d6ff87a24b6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/77085092-8736-4b4e-8a37-c1184b5c0889.png?resizew=458)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)类比探究:如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa74660971ce04b1041ecec0462e87e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ab83ac7814caf45813ba7689f34a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)拓展应用:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36395a1f890888bae8c6b1cfb95e8d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/587458141d890533c0c32aa249a27ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】已知:在
外分别以
,
为边作
与
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/a08f80fd-3af7-46cb-a7ba-5d7253002ee9.png?resizew=416)
(1)如图1,
与
分别是以
,
为斜边的等腰直角三角形,连接
,以
为直角边构造
,且
,连接
,
,
.
求证:
①
;
②四边形
是平行四边形.
(2)如图2,在
外分别以
,
为斜边作
与
,并使
,取BC的中点D,连接DE,EF请求出
的值及
的度数.
(3)如图3,在
外分别以
,
为底边作等腰三角形
和等腰三角形
,并使
与
之和为
,取
的中点D,连接
,
,当
,
,
,请用含a,b的代数式直接写出
的值,用含α的代数式直接表示
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0986ba5fcba791e3052488480ae175ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84fac7b2ba42c31be84e844415406851.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/a08f80fd-3af7-46cb-a7ba-5d7253002ee9.png?resizew=416)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0986ba5fcba791e3052488480ae175ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84fac7b2ba42c31be84e844415406851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e45b672655606f91d86bd37e0a2747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb40d27691c83993dffbd713a18077e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999a995a6d07c561ce64e8952994160a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11667abcb2759f301391b9850352be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9171484a68c84cad91e4f2233392f600.png)
求证:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85b8a658ec3fe01803fce6c5810b5a.png)
②四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f3cd70eb830808f2e4cfaf7318a680.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cec4464b5efa55e9b33a677d983667e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e70b7b6a06f9924ad0173db9cce091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1d6dcb48e35b6ee125b306c2f9d86a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b942540f5329b8531868993a54b434e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d7e138a524b349fdcce1c4de933aa0.png)
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7526fe1f1fcea600e7f28fa9808600ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745d613f4c21104c6c2cae961dac0f6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f41fb0e3d1966056998b2a2071a943a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fe05847c651fc905b80b7325533a16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18f15d76bbb10f12d237c568487ee41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00f7c4ab95176650df9c685ddb8e6df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d145406c1f057aaffce76eba11ad6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b942540f5329b8531868993a54b434e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d7e138a524b349fdcce1c4de933aa0.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图,边长为12
的等边三角形,点D从B点出发沿
方向在线段
上以
的速度运动,点E从C点出发沿
方向在线段CB上以
的速度运动.D、E两点同时出发,运动时间为
.当点D到达点A后,D、E两点停止运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/4dd2bc01-0db0-487b-a275-9cfba41237af.png?resizew=360)
(1)如图1,若速度
,连接
相交于点F.在点D到达点A前,直接写出
的度数
______;
(2)如图2,若速度
,
,连接
,相交于点F.当
时,求t的值;
(3)如图3,若速度
,
,连接
,以
为边作等边
,使M、B在
的两侧,点O为
的中点,连接
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ba837391bb4af88a9a5042248b81e2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf8d53b3aeef377bf2316c6998efa61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ec07b55a5df267892cef93a5e9808b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da016e8a7c6ba79fe6710a919d7d7e8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab02b0a664b7afd2632a159adaab336.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/30/4dd2bc01-0db0-487b-a275-9cfba41237af.png?resizew=360)
(1)如图1,若速度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48adb8a59b5c02fad5eada1b35171cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23c16f1d4a9fee044bbc9243550f548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed24d7acba0b3a7ebf4d520296424a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)如图2,若速度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23c16f1d4a9fee044bbc9243550f548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb1150e7caf86393601b45976f94f3e5.png)
(3)如图3,若速度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44ca79d5e12bd02c393ba7f0b31c8c9.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/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,把一副三角板按照图1摆放(点C与点E重合) ,点B,C,(E),F在同一直线上.∠ACB=∠DFE=90°,∠A=30°,∠DEF=45°,BC=EF=6cm,BM=
AB.△DEF从图1的位置出发,以1cm/s的速度沿CB方向匀速运动,如图2,DE与AC相交于点N,连接MN.当点D运动到AC边上时,△DEF停止运动.设运动时间为t秒:
![](https://img.xkw.com/dksih/QBM/2022/3/24/2943127333847040/3036667745361920/STEM/a9a12a98e83f4c948c8ba2f3313c2e61.png?resizew=287)
(1)当t=1时,直接写出CE、CN、AN的长;
(2)当t为何值时,线段MN⊥AC?
(3)当t为何值时,△AMN是等腰三角形?请直接写出满足条件的t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d1948aeac3e7bb891381f1d25364cb0.png)
![](https://img.xkw.com/dksih/QBM/2022/3/24/2943127333847040/3036667745361920/STEM/a9a12a98e83f4c948c8ba2f3313c2e61.png?resizew=287)
(1)当t=1时,直接写出CE、CN、AN的长;
(2)当t为何值时,线段MN⊥AC?
(3)当t为何值时,△AMN是等腰三角形?请直接写出满足条件的t的值.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】如图,在平面直角坐标系中,已知点A(0,2),△AOB为等边三角形,P是x轴上一个动点(不与原点O重合),以线段AP为一边在其右侧作等边三角形APQ.
(2)在点P运动过程中,∠ABQ的大小是否发生改变?若不改变,求出其大小;若改变,请说明理由.
(3)连接OQ,当OQ∥AB时,求点P的坐标.
(2)在点P运动过程中,∠ABQ的大小是否发生改变?若不改变,求出其大小;若改变,请说明理由.
(3)连接OQ,当OQ∥AB时,求点P的坐标.
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐2】如图,已知等边
,点
为
内的一点,连接
,以
为边向
上方作等边
,连接
(
).
![](https://img.xkw.com/dksih/QBM/2020/11/25/2600672704012288/2617385304006656/STEM/56b53542-d0d7-4bd8-8236-9d8178424ff5.png)
(1)求证:
.
(2)请判断
的形状,并证明你的结论.
(3)若
,求
的度数及
的面积(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/290c4b4730bcbcb92c5cd5cf26d65ff8.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/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a99aab094c2a54b9dd8a19b3c0e9ca3.png)
![](https://img.xkw.com/dksih/QBM/2020/11/25/2600672704012288/2617385304006656/STEM/56b53542-d0d7-4bd8-8236-9d8178424ff5.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ca6f9bb3556eb346c504afbba2151c.png)
(2)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4566f1bcf97dca6e933d7b2c537aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次