如图,边长为
的等边三角形
中,
分别是
边的中点,点
从
点沿着折线
运动,连接
,
绕点
逆时针旋转
到点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/35f90b81-5f3b-40c0-bece-e9fdb9f6b21a.png?resizew=560)
(1)如图1,当点
在
上运动时,求
的度数;
(2)如图2,连接
,设
点的运动速度为每秒
个单位长度,运动时间为
,请求出
的面积
关于
的函数关系式;并指出
的取值范围;
(3)当
是直角三角形时,直接写出此时
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e081ad7d639b4cef84a03b7658edca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/35f90b81-5f3b-40c0-bece-e9fdb9f6b21a.png?resizew=560)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030314ca026d6b18481682f70f48d19b.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/525fff1a6f716a90a144564f4e0a01bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7086e8d3bd8849157f34777645bf32d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8da6e6930cccd3dadf6241b92d27bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
更新时间:2023-04-28 15:05:34
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【推荐1】在边长为2的等边
中,点D是
中点,点E在线段
上
(1)如图1,
的最小值为 ;
(2)在
的下方作等边
,连接
,如图2,求出
的度数;如果变化;
(3)在图2的基础上,连接
,如图3,当
的周长最小时,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/9/ded62ec3-c055-40e4-a28b-fbd3f36a55c9.png?resizew=493)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd94dd51562ecbee6edd4265326b765.png)
(3)在图2的基础上,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1a13346c7971d064ef14cecd9a9ed5.png)
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【推荐2】如图1,在菱形ABCD中,AB=2,∠ABC=60°,点E为BD上一动点,在点E的运动过程中,始终保持EF
AB,EF=AB,连接DF,CF,CF与BD相交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/c36ccbe5-95f4-46e7-8fe2-2464a22024c2.png?resizew=473)
(1)如图1,求证四边形CDFE为平行四边形;
(2)当点E运动到什么位置时,四边形CDFE为矩形?并说明理由;
(3)如图2,延长DA到M,使AM=AD,连接ME,判断ME与CF的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/c36ccbe5-95f4-46e7-8fe2-2464a22024c2.png?resizew=473)
(1)如图1,求证四边形CDFE为平行四边形;
(2)当点E运动到什么位置时,四边形CDFE为矩形?并说明理由;
(3)如图2,延长DA到M,使AM=AD,连接ME,判断ME与CF的数量关系,并说明理由.
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【推荐1】如图①,
和
均为等边三角形、连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/349a2302-761c-448f-a5f2-690c52910a5c.png?resizew=455)
(1)直接写出
与
的数量关系为________________;直线
与
所夹锐角为______________度;
(2)将
绕点A逆时针旋转至如图②,取
,
的中点M,N,连接
,试问:
的值是否随图形的旋转而变化?若不变,请求出该值;若变化,请说明理由;
(3)若
,
,当图形旋转至B,D,E三点在一条直线上时,直接写出
的面积为_______________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/349a2302-761c-448f-a5f2-690c52910a5c.png?resizew=455)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2044b01c3e9f0bdece72ad17bdfd886d.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba56b41fe702d9b6433e4d01e48d69a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
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【推荐2】如图1,在
和
中,
,
,
,点
,
,
在同一条直线上,连结
.
(1)【问题解决】求证:
.
(2)若
,求
的度数.
(3)【类比探究】如图2,
和
均为等腰直角三角形,
,点
,
,
在同一条直线上,
为
的中点,连结
,
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f145e6d68a0903d4d10f27cf647ddc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/5e80d4f8-adec-4fb7-be25-97b9a2d9dcfb.png?resizew=299)
(1)【问题解决】求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64a983d34dd27801d526bb99541b5dd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5df3be4e18c4662478953781e1a6199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
(3)【类比探究】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d79e7020414add95907e061df505ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
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【推荐1】某校组织数学兴趣探究活动,爱思考的小实同学在探究两条直线的位置关系查阅资料时发现,两条中线互相垂直的三角形称为“中垂三角形”
如图
、图
、图
中,
、
是
的中线,
于点
,像
这样的三角形均称为“中垂三角形”.
【特例探究】
(1)如图
,当
,
时,
______,
______;
如图
,当
,
时,
______,
______;
【归纳证明】
(2)请你观察(
)中的计算结果,猜想
、
、
三者之间的关系,用等式表示出来,并利用图
证明你的结论.
【拓展证明】
(3)如图
,在
中,
,
,
、
、
分别是边
、
、
的中点,连结
并延长至
,使得
,连结
,当
于点
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e1d0f65817ba32a732040518f41440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187ed13a7bd532bd39af5e5ad7493a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/13/1d3bfc90-67d2-4bc6-b4b8-36e99ce4831a.png?resizew=569)
【特例探究】
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16bab906d4fc26acb1a7f681a3bb2981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c406e7d1e7977dd5b30ef81cfdc8e8d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be32271cf9ff64d57bfbd56ec7c3af05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
【归纳证明】
(2)请你观察(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/841f7f7a81d84110be1960c42724b8b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5993215cfc7cfdec291c76e76639f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/648cf8ab7773bbd7320ce7c51188ff2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
【拓展证明】
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bae5203f4b4acf23779114b3466e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/133760237c0ccf2d6a83786925b6d23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b439114941d8ad53b5aa79aeed15c1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8944bb1af77920b5018eebf3af16b2b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
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【推荐2】如图,平面直角坐标系
、
两点分别在x、y轴上,P为射线
上的一动点,点O关于直线
的对称点为
.
![](https://img.xkw.com/dksih/QBM/2023/3/10/3191472398974976/3194229899100160/STEM/e55d35f39fbd4954ad853ca1dcf9d5a2.png?resizew=217)
![](https://img.xkw.com/dksih/QBM/2023/3/10/3191472398974976/3194229899100160/STEM/40da9fac0bb34dce972484483943691f.png?resizew=191)
(1)当
的面积为15时,求点P坐标;
(2)当
为等腰三角形时,求点P坐标;
(3)若点O关于直线
的对称点为点D,当
为直角三角形时,请求出点P坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e8fd1ce0df99890a2147191d6fe8961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83ebc472717d6ddeeeabeb6dff738a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2023/3/10/3191472398974976/3194229899100160/STEM/e55d35f39fbd4954ad853ca1dcf9d5a2.png?resizew=217)
![](https://img.xkw.com/dksih/QBM/2023/3/10/3191472398974976/3194229899100160/STEM/40da9fac0bb34dce972484483943691f.png?resizew=191)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9dc427a01582ec222446b352d40ab0d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
(3)若点O关于直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】在平面直角坐标系中,
为原点,点
,点
.若正方形
绕点
顺时针旋转,得正方形
,记旋转角为
.
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170312639602688/2170851735601152/STEM/31daf1cb8f8542198384d69093e24abf.png?resizew=387)
(Ⅰ)如图①,当
时,求
与
的交点
的坐标;
(Ⅱ)如图②,当
时,求点
的坐标;
(Ⅲ)若
为线段
的中点,求
长的取值范围(直接写出结果即可).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b078585c75524673305d270e9eefab89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83ebc472717d6ddeeeabeb6dff738a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0c50654d011b19a3ab03dbcaa4b5cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170312639602688/2170851735601152/STEM/31daf1cb8f8542198384d69093e24abf.png?resizew=387)
(Ⅰ)如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c69a23d106fd34aa17b22e9c9a8de36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc890342ba48792f572f99e3f8c033a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(Ⅱ)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5d54dfb9237412a7c1c00658830de6.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa78ace12e5dca050ba2c70880d4d8ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】问题情景:老师让同学们以“两个大小不等的等腰直角三角板的直角顶点重合,并让一个三角板固定,另一个绕直角顶点旋转”为主题开展数学活动.如图
,
和
都是等腰直角三角形,
,点
分别在边
上,连接
,点
分别为
的中点.试判断线段
与
的数量关系和位置关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/234a23fe-7042-46e9-a411-82ada4f25e1c.png?resizew=289)
问题探究:
(
)甲小组发现:图
中,线段
与
的数量关系是 ,位置关系是 ;
(
)乙小组受到甲小组的启发,继续进行探究,把
绕点
逆时针方向旋转到如图
的位置,请判断
的形状并证明;
问题拓展:
(
)两小组的同学继续探究:把
绕点
在平面内自由旋转,当
时,直接写出线段
长度的最大值.
![](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/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3648c864f9f58da1dbb166fee84cfeaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa49835cb36d11ba406fa8cabbecd69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6be35b0b5a1c02505793d112ab044d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8617f1a3f0da6f3b90e3eb6ac5887d59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/234a23fe-7042-46e9-a411-82ada4f25e1c.png?resizew=289)
问题探究:
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
问题拓展:
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.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/19ac53f0f39c9e8c6809143dbf77e57a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次