给出如下定义:有一组对角互余的凸四边形叫对余四边形.
证明:
(1)如图
,
是
的直径,点
、
、
在
上,
,
相交于点
.求证:四边形
是对余四边形;
探究:
(2)如图
,在对余四边形
中,
=
,
、
为对角线,
,试探究线
、
和
之间的数量关系,并说明理由.
拓展:
(3)已知,在
中,
,
为
外一点,且四边形
为对余四边形,请直接写出对角线
的最大值.
证明:
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb85aa4871eb1dfb392613d429a9314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
探究:
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373a229b0b8b206bd22d13e00f42a014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
拓展:
(3)已知,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ce5a8397691a4610c8ac8df4d1b601.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/8e403ed6-b0f6-43ea-aed3-e32472300cb4.png?resizew=324)
更新时间:2024-04-08 18:44:37
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】如图,直线
经过点
,点
,与直线
交于点
,点
为直线
上一动点,过
点作
轴的垂线交直线
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/63aa9e5a-b350-43ac-b524-21921f352230.png?resizew=183)
(1)求直线
的函数关系式和点
的坐标;
(2)当
时,求点
的横坐标和
的面积;
(3)已知点
,在坐标轴上找一点
,连接
,
,
,当
是以
为底边的等腰直角三角形时,直接写出
点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd46d89196d9963d0dd592ecb70428fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c945c4e684ce805d9402bf0d9c6b228e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86bebdf5931efbdc627baa52f97392e.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/63aa9e5a-b350-43ac-b524-21921f352230.png?resizew=183)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f68e3f1f32212d5ef81addcdcda55eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec84fb889163dd29d907a55bbf6eca21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029ad83f1a3262048cba0e650b63e929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图1,在平面直角坐标系中,直线
:
与
交于点
,
与
轴,
轴分别交于A,B两点,
与x轴,y轴正半轴分别交于C,D两点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/094b3afb3579cba2f0730bdbc8d781e8.png)
的解析式;
(2)如图2,连接
,若点P为y轴负半轴上一点,点Q是x轴上一动点,连接
,
,
,当
时,求
周长的最小值;
(3)如图3,将直线
向上平移经过点D,平移后的直线记为
,若点M为y轴上一动点,点
为直线
上一点,是否存在点M,使
是等腰三角形?若存在,请直接写出点M的坐标,并写出其中一个点M的求解过程;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f0c0aa4d3777dfd5cfca76e713e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f5cfea0dfd90a428d75a1f82a153b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/094b3afb3579cba2f0730bdbc8d781e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a07c8017bd895910b9669783edd8fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e310ac26049fd114f77837f60938a17.png)
(3)如图3,将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f16108b3513153eb9c7fbd4ed237b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐1】如图,正方形
中,点
是射线
上一点.
(1)如图1,点
在对角线
上,点
在边
上,
.求证:四边形
是正方形;
(2)如图2,点
在正方形
内,点
在边
上,四边形
是正方形,求
的大小;
(3)如图3,点
是射线
上一动点,四边形
是以
为对角线的正方形,
是线段
的中点,
,请直接写出
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/31/02d5bc4c-1267-4a84-9aa6-fdc7c0651523.png?resizew=552)
(1)如图1,点
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9482cb7709ebf930e692b92005a58547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
(2)如图2,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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(3)如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c965f16192e57a8079a40a0304ef339b.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图,在平面直角坐标系中,已知Rt△AOB的两直角边OA、OB分别在x轴和y轴的正半轴上,A(8,0),B(0,6),点C从原点O出发,沿边OA向点A运动,速度为每秒1个单位长度,点D从点A出发,沿边AB向点B运动,速度为每秒2个单位长度.设两点同时出发,运动时间为t秒(0 < t < 5)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/9b12a3d1-10bd-446b-8398-2cb86527f334.png?resizew=534)
(1)当t= 时,DC
BO;
(2)当△ADC的面积为9时,求t的值;
(3)在(2)的条件下;
①作射线BC,若M是射线BC上的一个动点,在坐标平面内是否存在点P,使以A、B、M、P为顶点的四边形是矩形?若存在,请直接写出点P的坐标;若不存在,请说明理由.
② 过点C作直线
⊥x轴,过点B作直线
⊥y轴,直线
与直线
交于点P,反比例函数
(k>0,x>0)的图像与直线
、
分别交于点E、F,连接EF,在y轴上是否存在点Q,使得△PEF和△QEF全等,若存在,请直接写出相应的k的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/9b12a3d1-10bd-446b-8398-2cb86527f334.png?resizew=534)
(1)当t= 时,DC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)当△ADC的面积为9时,求t的值;
(3)在(2)的条件下;
①作射线BC,若M是射线BC上的一个动点,在坐标平面内是否存在点P,使以A、B、M、P为顶点的四边形是矩形?若存在,请直接写出点P的坐标;若不存在,请说明理由.
② 过点C作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐1】如图1,
为圆内接三角形,
于
、交⊙
于点
,
于
、交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/69cf2710-505a-4c78-a517-6b09beadaf66.png?resizew=432)
(1)求证:
;
(2)如图2,连接
,作
于
,求证:
;
(3)在(2)的条件下,连接
、
,若
,
,
,求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/69cf2710-505a-4c78-a517-6b09beadaf66.png?resizew=432)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46d93b877d359a4218e156b46d5aa3e.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e906874cc4ea6d079737a13fddbf9ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ea7e67702c153a21aec11b977cb1fa.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0045471b64be1a05bbe9a3824599e908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f3ac1a2075fb828849b586a9d3ab21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2971d308bdb5dfdce111ad886b3b5e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】我们定义:有一组对角为直角的四边形叫做“对直角四边形”.如图1,四边形ABCD中,∠A=∠C=90°,则四边形ABCD是“对直角四边形”.
![](https://img.xkw.com/dksih/QBM/2020/3/14/2419452280004608/2420551979769856/STEM/6ddcfe038034470ca521e76631f05b64.png?resizew=477)
(1)“对角线相等的对直角四边形是矩形”是______命题;(填“真”或“假”)
(2)如图2,在对直角四边形ABCD中,∠DAB<90°,AD+CD=AB+BC.试说明△ADC的面积与△ABC的面积相等;
(3)如图3,在△ABC中,∠C=90°,AC=6,BC=8,过AB的中点D作射线DP∥AC,交BC于点O,∠BDP与∠ADP的角平分线分别交BC,AC于点E、F.
①图中是“对直角四边形”的是______;
②当OP的长是______时,四边形DEPF为对直角四边形.
![](https://img.xkw.com/dksih/QBM/2020/3/14/2419452280004608/2420551979769856/STEM/6ddcfe038034470ca521e76631f05b64.png?resizew=477)
(1)“对角线相等的对直角四边形是矩形”是______命题;(填“真”或“假”)
(2)如图2,在对直角四边形ABCD中,∠DAB<90°,AD+CD=AB+BC.试说明△ADC的面积与△ABC的面积相等;
(3)如图3,在△ABC中,∠C=90°,AC=6,BC=8,过AB的中点D作射线DP∥AC,交BC于点O,∠BDP与∠ADP的角平分线分别交BC,AC于点E、F.
①图中是“对直角四边形”的是______;
②当OP的长是______时,四边形DEPF为对直角四边形.
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐1】如图1,在
中,
,D,E两点分别在
上,且
.将
绕点A顺时针旋转,得到
,延长
,
交于点F连接
,如图2所示,
;
(2)求证:
;
(3)若
,
,点P为
的中点当
旋转一周的过程中,求
的最大值.
![](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/17487118ab7a90fc8c91bf0870f3289e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a48a700725aa5032190e863c632d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b435d7fc33860ae191f9111d880b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f0ae0d8e74c9ca1708ce83c36c94df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d025bf758ad33fb58596134fc8a59d0a.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95087161482cf6fc8b7ad244be5fe9b8.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021ff5673121d6c5804a66af60e7e9fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】【发现问题】
数学小组在活动中,研究了一道有关相似三角形的问题:
例:如图1,在
中,点D是射线
上一点,连接
,若
,求证
.
,
,
∴
,
∴
,
∴
.
小睿同学经过分析、思考后,将这个三角形放在平面直角坐标系中,发现了一些规律.
【提出问题】
如图2,点B恰好与点
重合,
边在x轴上,若点D的纵坐标始终为
,
,那么随着
的变化,点C的位置发生变化;小睿同学通过描点、观察,提出猜想;按此方式描出的若干个点C都在某二次函数图象上.
(1)当
时,若
,所对应的点C的坐标为______.
【解决问题】
(2)当
时,请帮助小睿同学证明他的猜想.
【深度思考】
(3)点C的坐标为
,当
时,n的最大值为
,最小值为
,且
,求此时t的值.(规定:当点C与点B重合时,依然满足
)
数学小组在活动中,研究了一道有关相似三角形的问题:
例:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5625158769887177c3a2b41acd74d9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b766fc2f7d4049918b7bbfdb15f0b133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb138968e1bcbcd84e4dda73e0da7c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65adb645633e9346c40f8f1db40dabad.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53b82fc6a5b663e2e0ab0f58e979474.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8964f3455372ead9b5c3c45dd1f76dcc.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b766fc2f7d4049918b7bbfdb15f0b133.png)
小睿同学经过分析、思考后,将这个三角形放在平面直角坐标系中,发现了一些规律.
【提出问题】
如图2,点B恰好与点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff32d26c8d44f5fb4813a19c1030a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ff8c8d239cc12ddc3a899e9f054aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11f18be1bb30ce1eae192d5af0fb235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ff8c8d239cc12ddc3a899e9f054aa9.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3012337aa392709349731fb1eef5b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9673cb91a7efbc4abaa7124ab986bf1e.png)
【解决问题】
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3012337aa392709349731fb1eef5b5.png)
【深度思考】
(3)点C的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b5e761af39bc1725915c3c9ee7febee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa96774d815ca4200042a74d7d4b03d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c44826e58f11a58d3a6c233fc5df2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215b1424b299b737554386b090af8316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb97cedac5309f31ce7e65ffb41b0e88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b766fc2f7d4049918b7bbfdb15f0b133.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐3】如图,抛物线y=ax2+bx+c的图象,经过点A(1,0),B(3,0),C(0,3)三点,过点C,D(﹣3,0)的直线与抛物线的另一交点为E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/5/31b670a0-2d1e-4837-8ab2-00ba5eb59827.png?resizew=443)
(1)请你直接写出:
①抛物线的解析式 ;
②直线CD的解析式 ;
③点E的坐标( , );
(2)如图1,若点P是x轴上一动点,连接PC,PE,则当点P位于何处时,可使得∠CPE=45°,请你求出此时点P的坐标;
(3)如图2,若点Q是抛物线上一动点,作QH⊥x轴于H,连接QA,QB,当QB平分∠AQH时,请你直接写出此时点Q的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/5/31b670a0-2d1e-4837-8ab2-00ba5eb59827.png?resizew=443)
(1)请你直接写出:
①抛物线的解析式 ;
②直线CD的解析式 ;
③点E的坐标( , );
(2)如图1,若点P是x轴上一动点,连接PC,PE,则当点P位于何处时,可使得∠CPE=45°,请你求出此时点P的坐标;
(3)如图2,若点Q是抛物线上一动点,作QH⊥x轴于H,连接QA,QB,当QB平分∠AQH时,请你直接写出此时点Q的坐标.
您最近一年使用:0次