综合与实践
(1)问题发现:如图1,
和
均为等腰三角形,
,
,
,点A、D、E在同一条直线上,连接BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/5a142173-ffea-4b65-a0d0-e6416d0a055e.png?resizew=130)
①求证:
;
②若
,则
的度数为______.
(2)类比探究:如图2,
和
均为等腰直角三角形,
,点A、D、E在同一条直线上,
为
中
边上的高,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/6948d062-f1cb-4f69-8051-fc766f58a324.png?resizew=156)
①
的度数为______;
②线段
、
与
之间的数量关系为______.
(3)拓展延伸:在(2)的条件下,若
,
,则四边形
的面积为______.
(1)问题发现:如图1,
![](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/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ead706ccc238d868654030a3626847c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f145e6d68a0903d4d10f27cf647ddc7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/5a142173-ffea-4b65-a0d0-e6416d0a055e.png?resizew=130)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3223054560c8296227763d4cbb90194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
(2)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/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/6948d062-f1cb-4f69-8051-fc766f58a324.png?resizew=156)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
②线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d5630a7b28f45d49c5b670eb5b84fe.png)
(3)拓展延伸:在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee73d637e8260733851b10b322b9cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a876bc003f6c042c24ff4d8c11c8a8.png)
22-23八年级上·黑龙江齐齐哈尔·期末 查看更多[4]
黑龙江省齐齐哈尔市龙江县2022-2023学年八年级上学期期末数学试题黑龙江省讷河市2022-2023学年八年级上学期期末考试数学试题(已下线)压轴真题必刷03 平行线和三角形内角和定理(压轴30题5种题型训练)-2023-2024学年八年级数学上学期期末考点大串讲(北师大版)(已下线)2023江苏省苏州市中考数学变式题17-21题
更新时间:2023-02-25 12:34:36
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相似题推荐
解答题-问答题
|
较难
(0.4)
名校
【推荐1】在平面直角坐标系中,点
在y轴正半轴上,点
在x轴负半轴上,点
在x轴正半轴上,且a、b、c满足等式
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/4c56a122-1cc5-487a-971d-3dea4f79a394.png?resizew=571)
(1)如图1,求线段
的长;
(2)如图2,动点D从点B出发,以每秒2个单位长度的速度沿线段
向点A运动,连接
,过点O作
交
于点E,设
的面积为S,点D的运动时间为t秒,求S与t的关系式;
(3)在(2)的条件下,在
上取点P,在
上取点Q,使
,连接
、
、
、
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6991563453cd366d99513c393d1ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7255cbfbc86408b7cd865e89e5de0fb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd459f2ae8d33cc126a6a0c3351768f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26a9c3063390057788b1acc790aac106.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/4c56a122-1cc5-487a-971d-3dea4f79a394.png?resizew=571)
(1)如图1,求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如图2,动点D从点B出发,以每秒2个单位长度的速度沿线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e615356a4d004cc892512c35c4385e55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb6772cca18f6f1cfb7c961a425c8b2.png)
(3)在(2)的条件下,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731016f5081dca7e5726598d757c0449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350e954f629c1901a5cec03558319e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b8f94f977ea7b72c03dc37fa21341ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7023ec0f513c7d0ef86859a5ede54.png)
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【推荐2】如图,在平面直角坐标系中,已知点A(0,4),B(3,0),线段AB平移后对应的线段为CD,点C在x轴的负半轴上,B、C两点之间的距离为8.
(1)求点D的坐标;
(2)如图(1),求△ACD的面积;
(3)如图(2),∠OAB与∠OCD的角平分线相交于点M,探求∠AMC的度数并证明你的结论.
(1)求点D的坐标;
(2)如图(1),求△ACD的面积;
(3)如图(2),∠OAB与∠OCD的角平分线相交于点M,探求∠AMC的度数并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2019/8/10/2265905869062144/2266551066042368/STEM/979036531ffe4d83af1eaa6ff4753cde.png?resizew=418)
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【推荐1】如图,
,点
在射线
上运动(点
不与点
重合),点
在射线
上运动(点
不与点
重合),且
,
分别是
和
的平分线,它们相交于点
.
(1)如图1,当
时,求
的度数;
(2)点
,
在运动过程中,
的大小是否会发生变化?如果发生变化,请说明变化的情况;若不发生变化,试求出
的度数;
(3)如图2,作
的两外角
和
的平分线交于点
,延长
,
交于点
,在
中,存在一个内角的度数等于另外一个内角度数的2倍,请直接写出此时
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/089d8c3a67c7aa11b1fdfd9463770c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a457b899731577bfe61dda594ae4eec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bc29145f6e7557711c34b443bd5e84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/f4a60480-8839-456c-ab2b-37af68be483c.png?resizew=391)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e248c8c746a8bfca7ada103b6909d029.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
(2)点
![](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/1a55a1a244f81097e05e715b69580faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
(3)如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e1f58e4641d99f7c7c06aae0be23bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826fa702e700b8536f77e44b134ce334.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/ecff6005f926665a926c07ad62e0f032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7572ecc467c061ef71cf4486ec63ec3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2bc29145f6e7557711c34b443bd5e84.png)
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【推荐2】在
中,
是角平分线.
.
(1)如图(1),
是高,
,
,求
的度数;
(2)如图(2),点
在
上,
于
,试探究
与
、
的大小关系,并证明你的结论(提示:过点
作
于
);
(3)如图(3),点
在
的延长线上.
于
,试探究
与
、
的大小关系是______.(直接写出结论,不需证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e9019487563439986e1106739c4845.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/76a6a249-10c4-43ff-9941-79128fc0e699.png?resizew=380)
(1)如图(1),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19766bbdc2d23ae20e9f34530c3a1543.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14814fdc3ca8034bbd97cb76bed9c9d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(2)如图(2),点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eb5de7ac3b81d4bb5d79708f65034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(3)如图(3),点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
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【推荐1】如图,正方形
中,E为边
上一点,F是
延长线上的一点,且
,连接
交
于点G,交
于点H.
(1)求证:①
;②求
的度数;
(2)求证:
;
(3)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/b72b98fe-752a-422e-9f9c-afb5c24a62fd.jpg?resizew=191)
(1)求证:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000318258fe38f95e227622e778b41fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c19410c7abeae002ca97cfad4c791f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b8e633207f16c9477bc02c82a1dc78.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4654eca7d94bbe41ae88b82c183a1285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐2】如图,四边形
是边长为
的菱形,
,点
是射线
上一动点(点
与
、
不重合),
交
于点
,连结
.
;
(2)当
时,①求线段
的长,②求
的面积;
(3)设
,求使得
为直角三角形时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c315c1efb74cb4769bd2d43d9bc1b5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcfaca9396f85c0137b534903321fcbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcef01a0a65bf992e872bbf13db6419.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3cd61d00f89e68ccca2cac5c937783.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0a179491094a0b4fd4b04cbd99b2d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f9596850884048064a3ec8bd48c4762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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较难
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名校
【推荐3】阿基米德是有史以来最伟大的数学家之一,他与牛顿、高斯并称为三大数学王子,在后世的译文中保存了阿基米德折弦定理的内容.前苏联在1964年根据阿尔·比鲁尼本出版了俄文版《阿基米德全集》,第一题就是阿基米德的折弦定理.
【定理内容】一个圆中一条由两长度不同的弦组成的折弦所对的两段弧的中点在较长弦上的射影,就是折弦的中点.
【定理模型】如图①,已知AB和BC是
的两条弦(即折线ABC是
的一条折弦),
,M是
的中点,那么从M向弦BC作垂线的垂足D是折弦ABC的中点,即
.
下面是运用“补短法”证明
的部分证明过程:
如图②,延长DB至点F,使
,连接MF,AB,MC,MA,AC,…
【定理证明】按照上面思路,写出剩余部分的证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/129999ca-9f90-44f3-ab4a-5ec7c5a8b61b.png?resizew=533)
【问题解决】如图③,
内接于
,已知
,D为
上一点,连接AD,DC,
,
,求
的周长.
【定理内容】一个圆中一条由两长度不同的弦组成的折弦所对的两段弧的中点在较长弦上的射影,就是折弦的中点.
【定理模型】如图①,已知AB和BC是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c4e3cf5aa65a81a357c97a6b7ee5d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ff808cf596294204a404d0a34f3e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89e3e03158b56e714b771115443660d.png)
下面是运用“补短法”证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89e3e03158b56e714b771115443660d.png)
如图②,延长DB至点F,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6961ff0c507e6c21ee3af44e887c8c9.png)
【定理证明】按照上面思路,写出剩余部分的证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/129999ca-9f90-44f3-ab4a-5ec7c5a8b61b.png?resizew=533)
【问题解决】如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2e679d7b314ff58c284da08e8edbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b03bf58cba56d1b98a8a457982870b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ffff38ea8b2d25cc4388774f1fdecbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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较难
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【推荐1】在
中,
,
.
![](https://img.xkw.com/dksih/QBM/2020/2/15/2399781717557248/2400376814477312/STEM/53d5523a-9715-4826-a79e-e8730b390797.png)
(Ⅰ)如图Ⅰ,
为
边上一点(不与点
重合),将线段
绕点
逆时针旋转
得到
,连接
.
求证:(1)
;
(2)
.
(Ⅱ)如图Ⅱ,
为
外一点,且
,仍将线段
绕点
逆时针旋转
得到
,连接
,
.
(1)
的结论是否仍然成立?并请你说明理由;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://img.xkw.com/dksih/QBM/2020/2/15/2399781717557248/2400376814477312/STEM/53d5523a-9715-4826-a79e-e8730b390797.png)
(Ⅰ)如图Ⅰ,
![](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/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d97c37ca433bc22792ad348fadaad31.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba05e224a2bef711306391956883557.png)
(Ⅱ)如图Ⅱ,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ab46164b23af7a4c4907f176e392ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d97c37ca433bc22792ad348fadaad31.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905c7dbd4a489c232f4c7ceb05479ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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较难
(0.4)
【推荐2】已知正方形
中,点E是射线
上一点,连接
,作
的垂直平分线交直线
于点M,交直线
于点N,交
于点F.
上时,在
上取一点H,连接
,
,使得
.
①如图1,求
的度数;
②如图2,若
,
,求正方形边
的长;
(2)如图3,当点E在
的延长线上时,连接
并延长交
的延长线于点P,连接
.
①根据题意补全图形;
②直接写出
的度数__________;
③用等式表示线段
,
,
之间的数量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5481c3c38cf999b4dacada15ea517b8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61182c456ed7b68095a762967ae47744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f725c8541725d001d5e73caaaa9a493.png)
①如图1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c12fe8b47f09f1fcb7b2936576d2c2f7.png)
②如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e46902c589b964c055aee819dc3e4ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b7b0d1f022143cd6e5fd56b7497a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
(2)如图3,当点E在
![](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/9bb38289a49fbeed77bbc9eafd2217c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3137705cb4170baafa66ff46eefb7a.png)
①根据题意补全图形;
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ff8ae98a4922abf8c86c8028d9a067.png)
③用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca1d09859dfab140e55e3cc3e7d67d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d9792485ccd1ba479ceba6397c15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3ebde26dbb15a2a1081c77c6378e20.png)
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