在菱形
中,
,点P是对角线
上一点(不与点A重合),点E,F分别是边
上的点,且
,射线
分别与
的延长线交于点M,N.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/b94b8345-7753-43ee-9cfa-145e46169fb7.png?resizew=283)
(1)如图1,若点P与C重合,且
平分
,求证:
;
(2)连接
,若
,
,且
不平分
.
①依题意补全图2;
②用等式表示线段
的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137717f0e360e82319ced7e3a6c69b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddef81e3af08a62a69bc3e56a940bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c24b30d0775e565ad5aed48400c9f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39e79fa89469a99a447c6364b68bf08.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/b94b8345-7753-43ee-9cfa-145e46169fb7.png?resizew=283)
(1)如图1,若点P与C重合,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765917637583d22a579ff075f9baa3.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/867beccc3dc4bf90ba2797a2af801da5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638d9cccb679214718224c3088ed4a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
①依题意补全图2;
②用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564cc2c470001e7cd6fa28731a3875d5.png)
更新时间:2024-01-20 15:38:05
|
相似题推荐
解答题-证明题
|
较难
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名校
【推荐1】已知,正方形ABCD的边长为4,点E是对角线BD延长线上一点,AE=BD.将△ABE绕点A顺时针旋转α度(0°<α<360°)得到△AB′E′,点B、E的对应点分别为B′、E′.
(1)如图1,当α=30°时,求证:B′C=DE;
(2)连接B′E、DE′,当B′E=DE′时,请用图2求α的值;
(3)如图3,点P为AB的中点,点Q为线段B′E′上任意一点,试探究,在此旋转过程中,线段PQ长度的取值范围为 .
(1)如图1,当α=30°时,求证:B′C=DE;
(2)连接B′E、DE′,当B′E=DE′时,请用图2求α的值;
(3)如图3,点P为AB的中点,点Q为线段B′E′上任意一点,试探究,在此旋转过程中,线段PQ长度的取值范围为 .
![](https://img.xkw.com/dksih/QBM/2017/4/12/1664211708739584/1664856042258432/STEM/955147b077bd4de8aeb8bf6bedd1ccf5.png?resizew=412)
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【推荐2】在
中,
,
,
,以
为边在
外作等边三角形
,点
是
内部或边上一点,连接
,线段
绕点
顺时针旋转
后的对应线段为
,连接
.
在边
上,则线段
与线段
之间的数量关系是 ;线段
与线段
所在的两条直线相交所形成的锐角的度数为 ;
(2)图2中,若点
在
内部,判断(1)中的结论是否成立,并说明理由;
(3)在(2)的条件下,求
的最小值,并说明此时
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bae5203f4b4acf23779114b3466e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.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/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
(2)图2中,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在(2)的条件下,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e404e2084ed625488d3b8704d5f8034c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb914d185265890d91628b1810e87f1a.png)
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【推荐1】[问题情境]
如图1,小华将矩形纸片ABCD先沿对角线BD折叠,展开后再折叠,使点B落在射线
上,点
的对应点记为
,折痕与边
分别交于点
.
【特例感知】
(1)如图2,连接
,当点
与点
重合时,判断四边形
的形状,并说明理由;
【问题解决】
(2)如图3,当点
在线段
上时,连接
,设
与
分别交于点
,当
时,求证:
;
【深入探究】
(3)将(2)中的点
改为“在射线
上时”,(2)中其它条件不变的情形下,若
,
时,请直接 写出
的长.
如图1,小华将矩形纸片ABCD先沿对角线BD折叠,展开后再折叠,使点B落在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
【特例感知】
(1)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
【问题解决】
(2)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1fa63411b334ce13037ac0e81166e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db36b4497b911bc047253b832ae01c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde654b8bf0fb3f49acb19a8f4a1e48f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499c04aaca58c36c36430c2028103552.png)
【深入探究】
(3)将(2)中的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbc2025077fbc6922067afc766e1b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3772b40d508c907805997426c0623fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/7aaf0dfc-2d53-40c8-8c86-bc4f2b753f6a.png?resizew=548)
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【推荐2】在平面直角坐标系中,已知点
,点B(-3,0).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/28/8910058b-3dfa-450b-a579-a34d86d08677.png?resizew=572)
(1)如图1,点C为点A关于x轴的对称点,连接BC,判断△ABC的形状,并证明你的结论;
(2)如图2,作△ABC关于点B的中心对称图形△EBD,
为△EBD沿着x轴向右平移以后的图象,当
与△ABC重叠部分的图形为正六边形时,求此时的平移距离;
(3)如图3,点M为x轴上一动点,连接AM,将AM绕点M顺时针旋转60°得到线段NM,若N点恰好在某一条直线上运动,请求出该直线的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a84757fa1fc2e9bf6134c12dce7fe0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/28/8910058b-3dfa-450b-a579-a34d86d08677.png?resizew=572)
(1)如图1,点C为点A关于x轴的对称点,连接BC,判断△ABC的形状,并证明你的结论;
(2)如图2,作△ABC关于点B的中心对称图形△EBD,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f07562968608620bc9f2860e321096d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f07562968608620bc9f2860e321096d5.png)
(3)如图3,点M为x轴上一动点,连接AM,将AM绕点M顺时针旋转60°得到线段NM,若N点恰好在某一条直线上运动,请求出该直线的函数表达式.
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【推荐1】如图①,四边形OABC是一张放在平面直角坐标系中的正方形纸片,点O与坐标原点重合,点A在x轴上,点C在y轴上,OC=5,点E在边BC上,点N的坐标为(3,0),过点N且平行于y轴的直线MN与EB交于点M.现将纸片折叠,使顶点C落在MN上,并与MN上的点G重合,折痕为OE.
(1)点G的坐标为 ;点E的坐标为 ;
(2)如图②,若OG上有一动点P(不与O,G重合),从点O出发,以每秒1个单位的速度沿OG方向向点G匀速运动,设运动时间为t秒(0<t<5),过点P作PH⊥OG交OE于点H,连接HG,求出△PHG的面积s与t的函数关系式;
(3)在(2)的条件下,求当t为何值时,以点P、H、G为顶点的三角形与△OEG相似?
(1)点G的坐标为 ;点E的坐标为 ;
(2)如图②,若OG上有一动点P(不与O,G重合),从点O出发,以每秒1个单位的速度沿OG方向向点G匀速运动,设运动时间为t秒(0<t<5),过点P作PH⊥OG交OE于点H,连接HG,求出△PHG的面积s与t的函数关系式;
(3)在(2)的条件下,求当t为何值时,以点P、H、G为顶点的三角形与△OEG相似?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/2531ef3f-ba83-46db-a4cc-80cfa5c8b083.png?resizew=375)
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【推荐2】已知:如图,在等腰直角△ABC中,AC=BC,斜边AB的长为4,过点C作射线CP//AB,D为射线CP上一点,E在边BC上(不与B、C重合),且∠DAE=45°,AC与DE交于点O.
![](https://img.xkw.com/dksih/QBM/2014/3/27/1573717348843520/1573717354938368/STEM/04c4b07d41e545d290d8e30480a0fc9c.png?resizew=201)
(1)求证:△ADE∽△ACB;
(2)设CD=x,
BAE = y,求y关于x的函数解析式,并写出它的定义域;
(3)如果△COD与△BEA相似,求CD的值.
![](https://img.xkw.com/dksih/QBM/2014/3/27/1573717348843520/1573717354938368/STEM/04c4b07d41e545d290d8e30480a0fc9c.png?resizew=201)
(1)求证:△ADE∽△ACB;
(2)设CD=x,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e3e5069dc465f9562825990116482d.png)
(3)如果△COD与△BEA相似,求CD的值.
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【推荐1】如图,矩形
中,AB=4,AD=3,M是边CD上一点,将△ADM沿直线AM对折,得到△ANM.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/4e23e3ac-8506-485b-8561-68e17793915a.png?resizew=292)
(1)当AN平分∠MAB时,求DM的长;
(2)当射线BN交线段CD于点F时,求DF的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/4e23e3ac-8506-485b-8561-68e17793915a.png?resizew=292)
(1)当AN平分∠MAB时,求DM的长;
(2)当射线BN交线段CD于点F时,求DF的最大值.
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解答题-证明题
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【推荐2】综合与实践
如图1,在
中,
,
,
是
边上一点,将
绕点
顺时针方向旋转,使
与
重合,得到
,过点
作
,交
于点
,过点
作
于点
.
(1)求证:四边形
是正方形;
(2)如图2,在
中,
,
.
是
边上一点,将
绕点
顺时针方向旋转,使
落在边
上,得到
,过点
作
,分别交
,
,
于点
,
,
,过点
作
,交
于点
,且
.求证:四边形
是矩形;
(3)在图2中,若
,
,
,
.将
绕点
顺时针方向旋转,使
落在边
上,得到
,过点
作
,分别交
,
,
于点
,
,
.求线段
的长度.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476b0b8378f4b0f73f3dc5d84d89f616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7699dd30e08702bfc6499eb9c89e54a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/17/4aadd72c-e4d1-4a51-b76d-8416985c453d.png?resizew=427)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
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(3)在图2中,若
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