![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcba110804ba8bcfdc4a613b3703498.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/37a0397c811fe80c80ecd5b871201987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075bc6df108c9c2b3b5ac46bca7c8d3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/cc2a7faa-f306-41f2-b748-489258aad797.png?resizew=598)
(1)如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2be6dc65777a28b1a6436d1720b5523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aad190f9a320e6b9ba6a572c8c3f321.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/6c2b5c627c89998b9fe40a9d6a844e7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e099bf546d6a5d543c03965c01e2a0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4264b16e964ca71f2ad0c0937a1c413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/c2e1db385f16ebb7fa24bd8f1b36978b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e1db385f16ebb7fa24bd8f1b36978b.png)
(3)如图③,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02c2e805403cecd8b95cca44aee621bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ff8c8d239cc12ddc3a899e9f054aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2be6dc65777a28b1a6436d1720b5523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a42c3937c15655c4aedf937c77462d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e6b97f0316e66bd06d487856fb688d4.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/f15347d7870120325031b981affdac48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aad190f9a320e6b9ba6a572c8c3f321.png)
21-22七年级下·江苏扬州·期中 查看更多[7]
江苏省扬州市江都区2021-2022学年七年级下学期期中数学试题(已下线)专题32 与角平分线+余角补角有关的计算-【微专题】2022-2023学年七年级数学上册常考点微专题提分精练(苏科版)(已下线)专题11 内外角平分线综合问题-【微专题】2022-2023学年七年级数学下册常考点微专题提分精练(苏科版)(已下线)专题13.9 三角形中的边角关系、命题与证明章末八大题型总结(拔尖篇)-2023-2024学年八年级数学上册举一反三系列(沪科版)(已下线)专题11.10 三角形章末八大题型总结(拔尖篇)-2023-2024学年八年级数学上册举一反三系列(人教版)(已下线)专题1.13 三角形的初步知识章末十六大题型总结(拔尖篇)-2023-2024学年八年级数学上册举一反三系列(浙教版)(已下线)专题7.11 平行线的证明章末十一大题型总结(拔尖篇)-2023-2024学年八年级数学上册举一反三系列(北师大版)
更新时间:2022-08-09 16:32:14
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相似题推荐
解答题-问答题
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较难
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【推荐1】对于湘教版数学七年级下册第110页第15题:“如图1,OB、OD分别平分∠ABD和∠BDC,∠1+∠2=90°,那么AB与CD有什么关系?试说明理由.”
小亮同学在做完了该题后,与学习小组的同学在“课后服务”进一步开展了探究活动:
如图,AB∥CD,OB、OD分别平分∠ABD和∠BDC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/73135be4-820e-4fbd-b5e6-55178915408e.png?resizew=507)
(1)如图1,那么OB与OD有什么关系?试说明理由.
(2)延长BO与CD相交于点E,过点E作EF⊥BE,EF与BD的延长线相交于点F,
①如图2,∠DFE=28°,小亮发现可以求出∠DEF的大小,请你帮助小亮同学写出求∠DEF的大小的过程.
②如图3,连接OF,点M是EF上一点,∠MOF=∠MFO,ON平分∠BOM交BD于点N,学习小组的小明同学发现∠FON的大小不变,请你直接写出∠FON的大小是 .
小亮同学在做完了该题后,与学习小组的同学在“课后服务”进一步开展了探究活动:
如图,AB∥CD,OB、OD分别平分∠ABD和∠BDC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/73135be4-820e-4fbd-b5e6-55178915408e.png?resizew=507)
(1)如图1,那么OB与OD有什么关系?试说明理由.
(2)延长BO与CD相交于点E,过点E作EF⊥BE,EF与BD的延长线相交于点F,
①如图2,∠DFE=28°,小亮发现可以求出∠DEF的大小,请你帮助小亮同学写出求∠DEF的大小的过程.
②如图3,连接OF,点M是EF上一点,∠MOF=∠MFO,ON平分∠BOM交BD于点N,学习小组的小明同学发现∠FON的大小不变,请你直接写出∠FON的大小是 .
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解答题-作图题
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较难
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【推荐2】已知∠AOB=∠COD=90°,OE平分∠BOC.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2900586014883840/2970856597929984/STEM/9465c827-f1ee-44c7-9b8a-1733eb11e423.png?resizew=145)
(1)如图,若∠AOC=30°,则∠DOE的度数是______;(直接写出答案)
(2)将(1)中的条件“∠AOC=30°”改为“∠AOC是锐角”,猜想∠DOE与∠AOC的关系,并说明理由;
(3)若∠AOC是钝角,请先画出图形,再探索∠DOE与∠AOC之间的数量关系.(不用写探索过程,将结论直接写在你画的图的下面)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2900586014883840/2970856597929984/STEM/9465c827-f1ee-44c7-9b8a-1733eb11e423.png?resizew=145)
(1)如图,若∠AOC=30°,则∠DOE的度数是______;(直接写出答案)
(2)将(1)中的条件“∠AOC=30°”改为“∠AOC是锐角”,猜想∠DOE与∠AOC的关系,并说明理由;
(3)若∠AOC是钝角,请先画出图形,再探索∠DOE与∠AOC之间的数量关系.(不用写探索过程,将结论直接写在你画的图的下面)
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【推荐3】已知
,
为
内部的一条射线,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/167ef540-da77-4308-96ca-fb8509138684.png?resizew=503)
(1)如图1,若
平分
,
为
内部的一条射线,
,则
;
(2)如图2,若射线
绕着O点从
开始以每秒
的速度顺时针旋转至
结束、
绕着O点从
开始以每秒
的速度逆时针旋转至
结束,当一条射线到达终点时另一条射线也停止运动.若运动时间为t秒,当
时,求t的值;
(3)如图3,若射线
绕着O点从
开始以每秒
的速度逆时针旋转至
结束,在旋转过程中,
平分
,试问:
在某时间段内是否为定值?若不是,请画出图形,并说明理由;若是,请画出图形,并直接写出这个定值以及t相应所在的时间段.(题中的角均为大于
且小于
的角)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e847513a54d0e5a8433f583767ccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36c0d4e38748fbb4a6cf5e700e5e874.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/167ef540-da77-4308-96ca-fb8509138684.png?resizew=503)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ec6a05ff1ff83f38709ec33bc4a4c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b600f913d6d700bbd332b34220b78a21.png)
(2)如图2,若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/741a44528782580d24249e8075b8cd9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/452b86e0dc0dc4d2d6d524a358b15fdb.png)
(3)如图3,若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92f279be7c8a11dcd2c0a97116bdcbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a237f36c819d5e322a3b75e67fb48b8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
您最近一年使用:0次
解答题-问答题
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较难
(0.4)
名校
【推荐1】已知直线
,点
、
分别为
,
上的动点,且
平分
交
于
.
,若
,
,
①直接写出
的度数;
②求
与
的度数.
(2)如图
,延长
交直线
于
,
平分
交
于点
,写出
与
的关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3907909bc37318fc73d9be9025989af0.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93287366eb7c6d40208734cde6a2e41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0266424cc3bee4a6f840084d1efe835c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3177a657a66974f53b49dc827b78c5c7.png)
①直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e983c9234a1904873fbebd09a20d676c.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91471da4a77df63164169d4858666563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5806d4fc9cec11b162bb3747e718ab65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5344517410852c935043de2b496f6b.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】已知:
,
,
,
是从点O引出的三条射线.
(1)如图1,若
平分
,
平分
,当
时,
______;当射线
绕点O在
内部旋转时,
______;
(2)如图2,若
,
平分
,
平分
,当
绕点O在
内旋转时,试说明:
与
互余;
(3)如图3,当射线
在
外,若
,
平分
,
平分
.
①当
小于
时,猜想
与
的关系,并说明理由;
②当
大于
而小于
时,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb24d9a963337d4804e07c7551119753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/ab35a0a6-dd42-4d82-94fb-bb758d71c6af.png?resizew=549)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08991e33572d0a7a830db8de33b88fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08991e33572d0a7a830db8de33b88fe9.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db91877e869a8d58b2bab2c39756d7fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a52e349973e2c589b48066c9068a8e.png)
(3)如图3,当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7b8a59f8d66176463f3d71f882a26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db91877e869a8d58b2bab2c39756d7fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a52e349973e2c589b48066c9068a8e.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
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【推荐1】探究:如图①,在△ABC中,∠ACB=90°,CD⊥AB于点D,若∠B=30°,则∠ACD的度数是 度;
拓展:如图②,∠MCN=90°,射线CP在∠MCN的内部,点A、B分别在CM、CN上,分别过点A、B作AD⊥CP、BE⊥CP,垂足分别为D、E,若∠CBE=70°,求∠CAD的度数;
应用:如图③,点A、B分别在∠MCN的边CM、CN上,射线CP在∠MCN的内部,点D、E在射线CP上,连接AD、BE,若∠ADP=∠BEP=60°,则∠CAD+∠CBE+∠ACB= 度.
拓展:如图②,∠MCN=90°,射线CP在∠MCN的内部,点A、B分别在CM、CN上,分别过点A、B作AD⊥CP、BE⊥CP,垂足分别为D、E,若∠CBE=70°,求∠CAD的度数;
应用:如图③,点A、B分别在∠MCN的边CM、CN上,射线CP在∠MCN的内部,点D、E在射线CP上,连接AD、BE,若∠ADP=∠BEP=60°,则∠CAD+∠CBE+∠ACB= 度.
![](https://img.xkw.com/dksih/QBM/2020/4/17/2443615704629248/2445038449983488/STEM/f3d702e219974e66b462b77a5c4ddedb.png?resizew=394)
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解题方法
【推荐2】如图1,直角三角形DEF与直角三角形ABC的斜边在同一直线上,∠EDF=30°,∠ABC=40°,CD平分∠ACB,将△DEF绕点D按逆时针方向旋转,记∠ADF为α(0°<α<180°),在旋转过程中;
(1)如图2,当∠α= 时,
,当∠α= 时,DE⊥BC;
(2)如图3,当顶点C在△DEF内部时,边DF、DE分别交BC、AC的延长线于点M、N,
①此时∠α的度数范围是 ;
②∠1与∠2度数的和是否变化?若不变求出∠1与∠2度数和;若变化,请说明理由;
③若使得∠2≥2∠1,求∠α的度数范围.
(1)如图2,当∠α= 时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e210c9698063925ad2df6b6c1749571.png)
(2)如图3,当顶点C在△DEF内部时,边DF、DE分别交BC、AC的延长线于点M、N,
①此时∠α的度数范围是 ;
②∠1与∠2度数的和是否变化?若不变求出∠1与∠2度数和;若变化,请说明理由;
③若使得∠2≥2∠1,求∠α的度数范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/c1cbf382-6119-447d-a82e-1ef3b3ea842e.png?resizew=448)
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【推荐3】在
中,
,分别过点A、B两点作过点C的直线m的垂线,垂足分别为点D、E.
(1)如图1,当
,点A、B在直线m的同侧时,求证:
;
(2)如图2,当
,点A、B在直线m的异侧时,请问(1)中有关于线段
、
和
三条线段的数量关系的结论还成立吗?若成立,请你给出证明;若不成立,请给出正确结论,并说明理由;
(3)如图3,当
,
,点A、B在直线m的同侧时,一动点M以每秒
的速度从A点出发沿A→C→B路径向终点B运动,同时另一动点N以每秒
的速度从B点出发沿B→C→A路径向终点A运动,两点都要到达相应的终点时才能停止运动.在运动过程中,分别过点M和点N作
于P,
于Q.设运动时间为t秒,当t为何值时,
与
全等?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82da6815bc213dfd78c2f77cd7ded8ed.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/c99fc166-16a6-4ecd-9405-00a817f3ee05.png?resizew=516)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ea876dd79d6dd4bf30c8af6438dc21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799e6e9698b94321baa21b29aae3b773.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ea876dd79d6dd4bf30c8af6438dc21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6241ff619f9236d4779eabdece3ce0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bba23fda9802f8105b02c7a479a6699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5992036c739557714bc05e08a93bdd3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d73d378e28bd29110ab5feb0b4f8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dec0adfcfea629c3be8b69be50bdaef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/531ddd2c6a1e6a37a55bac7edbf4acf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37338c47779302e808905b3a0bfea768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/903f644567f8c6ec159bf28650d74bd6.png)
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【推荐1】△ABC中,
,AC=BC,点D是BC边上的一个动点,连接AD,过点B作BF⊥AD于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/8bf07a19-3edc-4b48-87da-dc6fdb4157a7.png?resizew=424)
(1)如图1,分别延长AC,BF相交于点E,求证:BE=AD;
(2)如图2,若AD平分∠BAC,AD=5,求BF的长;
(3)如图3,M是FB延长线上一点,AD平分∠MAC,试探究AC,CD,AM之间的数量关系并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/8bf07a19-3edc-4b48-87da-dc6fdb4157a7.png?resizew=424)
(1)如图1,分别延长AC,BF相交于点E,求证:BE=AD;
(2)如图2,若AD平分∠BAC,AD=5,求BF的长;
(3)如图3,M是FB延长线上一点,AD平分∠MAC,试探究AC,CD,AM之间的数量关系并说明理由.
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名校
【推荐2】如图,在
中,过C作
的平分线AD的垂线,垂足为D,AD交BC于G,
交AC于E,且
.
(1)试说明
.
(2)作
的平分线CF交AD于P,交AB于F,试说明
.
(3)(2)的条件下,若
,试判断AF、CG、AC的关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0137c721b8d4ea6dca8b7d9761134726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0487ebca22d4aa1233073f81fd70a424.png)
(1)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a93e0b6156befa00b50bdfaef95d9.png)
(2)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302efd5266f7868d8c67f7bb09dc2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17634adf4bce397fcaeb8b7401fa109a.png)
(3)(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://img.xkw.com/dksih/QBM/2020/12/28/2631037118480384/2681206105382912/STEM/a4c7b9315667434394f8c09867979b0e.png?resizew=179)
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【推荐3】![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/b8c72a51-e776-4740-996d-1d7a496446fb.png?resizew=518)
(1)探究一:我们知道,三角形的一个外角等于与它不相邻的两个内角的和.那么,三角形的一个内角与它不相邻的两个外角的和之间存在何种数量关系呢?
如图甲,
为
的两个外角,则
与
的数量关系 .
(2)探究二:三角形的一个内角与另两个内角的平分线所夹的钝角之间有何种关系?
如图乙,在
中,
分别平分
和
,则
与
的数量关系 .
(3)探究三:若将
改为任意四边形
呢?
已知:如图丙,在四边形
中,
分别平分
和
,则
与
的数量关系 .
(4)探究四:若将上题中的四边形
改为六边形
呢?如图丁
则
与
的数量关系 .
(5)探究五:如图,四边形
中,
为四边形
的
的角平分线及外角
的平分线所在的直线构成的锐角,若设
;
如图①,
,则
;(用α,β表示)
如图②,
,请在图中画出
,且
;(用α,β表示)
一定存在
吗?如有,直接写出
的值,如不一定,直接指出α,β满足什么条件时,不存在
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/b8c72a51-e776-4740-996d-1d7a496446fb.png?resizew=518)
(1)探究一:我们知道,三角形的一个外角等于与它不相邻的两个内角的和.那么,三角形的一个内角与它不相邻的两个外角的和之间存在何种数量关系呢?
如图甲,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb5720bbde28a722e1d4d257dc390ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed8afba9cbc4689ba7752e86c3f30f46.png)
(2)探究二:三角形的一个内角与另两个内角的平分线所夹的钝角之间有何种关系?
如图乙,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9327c73fcb19e782916d90ccaa363a0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(3)探究三:若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
已知:如图丙,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9327c73fcb19e782916d90ccaa363a0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8cae4c78e63ccc3ae5ad336d4b2959.png)
(4)探究四:若将上题中的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764ed37dbcad7400fd7735b626f26164.png)
(5)探究五:如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8c257f5615d30660cef4157c6b273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03f9e5970380603e0e9eec42846ee863.png)
如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6db901868524464ef016565f59cbda2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/127eef97aeb02eb6610a149fdb9bf9ad.png)
如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b76dbad5ee0d2732c5d4984e5a2caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8c257f5615d30660cef4157c6b273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/127eef97aeb02eb6610a149fdb9bf9ad.png)
一定存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8c257f5615d30660cef4157c6b273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8c257f5615d30660cef4157c6b273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e8c257f5615d30660cef4157c6b273.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/5432ba90-350f-40ee-8d39-0bc0928c58c2.png?resizew=327)
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