已知AM∥CN,点B为平面内一点,AB⊥BC于B
![](https://img.xkw.com/dksih/QBM/2020/3/22/2424922546577408/2425131826970624/STEM/a2899a397209464d8871ad66a462e949.png?resizew=452)
(1)如图1,直接写出∠A和∠C之间的数量关系;
(2)如图2,过点B作BD⊥AM于点D,求证:∠ABD=∠C;
(3)如图3,在(2)问的条件下,点E.F在DM上,连接BE.BF.CF,BF平分∠DBC,BE平分∠ABD,若∠FCB+∠NCF=180°,∠ABF=2∠ABE,求∠EBC的度数.
![](https://img.xkw.com/dksih/QBM/2020/3/22/2424922546577408/2425131826970624/STEM/a2899a397209464d8871ad66a462e949.png?resizew=452)
(1)如图1,直接写出∠A和∠C之间的数量关系;
(2)如图2,过点B作BD⊥AM于点D,求证:∠ABD=∠C;
(3)如图3,在(2)问的条件下,点E.F在DM上,连接BE.BF.CF,BF平分∠DBC,BE平分∠ABD,若∠FCB+∠NCF=180°,∠ABF=2∠ABE,求∠EBC的度数.
18-19七年级下·湖南张家界·期末 查看更多[4]
湖南省张家界市桑植县2018-2019学年七年级下学期期末数学试题(已下线)专题5.25 《相交线与平行线》平行线、角平分线问题(提高篇)(专项练习)-2020-2021学年七年级数学下册基础知识专项讲练(人教版)福建省厦门市厦门第一中学2021-2022学年七年级下学期期中数学试题湖南省花垣县华鑫教育集团2022-2023学年七年级下学期期中数学试题
更新时间:2020-03-22 18:06:14
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解答题-证明题
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名校
【推荐1】已知:如图(1)直线AB、CD被直线MN所截,∠1=∠2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/5cd6220d-9c6d-439b-8a26-367ae4e6678c.png?resizew=573)
(1)求证:AB∥CD;
(2)如图(2),点E在AB,CD之间的直线MN上,P、Q分别在直线AB、CD上,连接PE、EQ,PF平分∠BPE,QF平分∠EQD,则∠PEQ和∠PFQ之间有什么数量关系,请直接写出你的结论;
(3)如图(3),在(2)的条件下,过P点作PH∥EQ交CD于点H,连接PQ,若PQ平分∠EPH,∠QPF:∠EQF=1:5,求∠PHQ的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/5cd6220d-9c6d-439b-8a26-367ae4e6678c.png?resizew=573)
(1)求证:AB∥CD;
(2)如图(2),点E在AB,CD之间的直线MN上,P、Q分别在直线AB、CD上,连接PE、EQ,PF平分∠BPE,QF平分∠EQD,则∠PEQ和∠PFQ之间有什么数量关系,请直接写出你的结论;
(3)如图(3),在(2)的条件下,过P点作PH∥EQ交CD于点H,连接PQ,若PQ平分∠EPH,∠QPF:∠EQF=1:5,求∠PHQ的度数.
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【推荐2】如图,
是菱形
的对角线,将线段
绕点B逆时针旋转得线段
,
的平分线与边
交点为E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/5f279613-d9fb-4892-917e-af74ed446931.png?resizew=497)
(1)如图1,点F在
的延长线上,求证:
平分
;
(2)如图2,点F在
上,若
,求
的值;
(3)如图3,若
与
交于点G,延长
、
交于点M,延长
、
交于点H,已知
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e99c17d72c203b50802f19d4731545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/16/5f279613-d9fb-4892-917e-af74ed446931.png?resizew=497)
(1)如图1,点F在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a2e6494cf8d2dff0746a9bb72cef43.png)
(2)如图2,点F在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d489973210e5efad4495e5b663d2e8ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c06b39a3804e08a580e8defa3e84cb.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef329b04409b820a68c2255f426908ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/299a4bb96c26826f4570e5ab5f8667b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e284ded32b7bf52a0d7bf6bec6a837.png)
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【推荐1】如图,过点
在
内部作射线
.
,
分别平分
和
,
与
互补,
.
(1)如图1,若
,则
______°,
______°,
______°;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/8b0c39a6-726b-4f67-9987-69fbdb9f1bb3.png?resizew=161)
(2)如图2,若
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/6cbf3b71-0aab-41a8-a932-39b115807731.png?resizew=161)
①当
时,求
度数;
②试探索:
是否为定值,若是,请求出这个定值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e6df7e5fd04706f0bcb2241508cfea.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0218f347088fa55497947c1283b39a7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ee2382164e0b53ec4d0ea9a7e583d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128838eb6cc0c80fbef3c8cdc3c5b8d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08991e33572d0a7a830db8de33b88fe9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/8b0c39a6-726b-4f67-9987-69fbdb9f1bb3.png?resizew=161)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/6cbf3b71-0aab-41a8-a932-39b115807731.png?resizew=161)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2842c7088db3915cccbea00b8d71877d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
②试探索:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e0eb7265a3708af5a94b0c737012b7.png)
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【推荐2】直线
相交于点
于点
,作射线
,且
在
的内部.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/a1e6d0bc-0aa5-478b-89f4-1395f8159f26.png?resizew=594)
(1)当点
在直线
的同侧;
①如图1,若
,求
的度数;
②如图2,若
平分
,请判断
是否平分
,并说明理由;
(2)若
,请直接写出
与
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcf86f7cf381c563ad80af86feeed83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec193146bdade8a396b61e678108f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/a1e6d0bc-0aa5-478b-89f4-1395f8159f26.png?resizew=594)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce9b6bb1f3e46026af863b2b269ecf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4dcfaa4ae137eea94b0211b82b81073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
②如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e916ba94f989259e5ec55a51b7b2c1f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7307ac7510cf35f74337d368b94da4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
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【推荐3】如果两个角的差等于
,就称这两个角互为“兄弟角”.其中一个角叫做另一个角的“兄弟角”.例如
,
,
,则a和β互为“兄弟角”,即a是β的“兄弟角”,β也是α的“兄弟角”.
(1)已知
和
互为“兄弟角”.
,且
和
互补,求
的度数.
(2)在
中,
,
是
的角平分线,
①如图1,点P在射线
上,
平分
,与射线
交于点N,若
与
互为“兄弟角”,求
的度数.
②如图2,若
,射线
平分
且与射线
交于点N,若
与
互为“兄弟角”,则
的度数为 .
③如图3,若
于点P,
、
相交于点F,若
与
互为“兄弟角”,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2573fbb43949ec6ba7c0fba84b10876b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e336e9716234b34fb4814e1fc74b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13b448ba9e77394b15633bec73bdd9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/5/8ee6ee41-77ab-4831-8141-54edeb6641cc.png?resizew=377)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e5e24c5752a140a1dfb5dbc3dedabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9463cdd7f187734678e4fb53d73b2865.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
①如图1,点P在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96bd06fe6c593497916181bf13a5fd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b25f247281afb586b3c686687eae858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
②如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df055e9b82f0590171adf25dd97df6b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96bd06fe6c593497916181bf13a5fd14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b25f247281afb586b3c686687eae858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
③如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2e118d8156830746055c1b2e759ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a019aeda16984ccf31f7294c216a57c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adcae9d00980803e5955228d1e217abe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
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【推荐1】如图,在平面直角坐标系中,点A的坐标为
,点
的坐标为
,点
的坐标为
,
是以点D为直角顶点的等腰直角三角形,点E在第三象限,点D在x轴上运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/3f061154-304e-476e-a03d-5a6897a72049.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/94ff0158-9ce7-4f6f-b200-5d8e42cfb4d6.png?resizew=179)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/fc8804c5-dde7-476e-8869-45cf2e4c13db.png?resizew=190)
(1)如图1所示,当点
的坐标为
时,求点
的坐标;
(2)如图2所示,点
在线段
上运动时,连接
、
,连接
并延长与
轴交于点
,求点
的坐标;
(3)如图3,设
的边
与
轴交于点
,
与
轴交于点
,当点
在线段
上运动,且满足
时,在线段
上取点
,且
,连接
交
轴于点
.下列结论:①
;②
为等腰三角形,其中只有一个结论是正确,请判断出正确的结论,并写出证明过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd0825e68122a65426840fbf07cf296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ed24bfcc37b79fe9ca61ed8fdf26ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1a65d88f9823d49da8f3b96ea9ec6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/3f061154-304e-476e-a03d-5a6897a72049.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/94ff0158-9ce7-4f6f-b200-5d8e42cfb4d6.png?resizew=179)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/fc8804c5-dde7-476e-8869-45cf2e4c13db.png?resizew=190)
(1)如图1所示,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)如图2所示,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图3,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9387771138f9e6f9ba3c12dab0118a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1463ddfb2ba6015d75b6b87a4c6a43e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad8a4e80b754849efd80db4a4f49eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6d77f7eb0e0268c011c351672ef7133.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】
是等边三角形,点D是
边上动点,
,把
沿
对折,得到
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/524f6552-3500-4918-9fb7-71dbe131d019.png?resizew=246)
(1)如图1,若
,则
°.
(2)如图2,点P在
延长线上,且
.
①连接
,试探究
,
,
之间是否存在一定数量关系,猜想并说明理由.
②连接
,若
,C,P三点共线,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af86db9a9c5083c1756ea9adcceebfca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ea25ef38e4afa8f75ffd0842890289.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/524f6552-3500-4918-9fb7-71dbe131d019.png?resizew=246)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671fdac69c4951a72cc06f6d598044dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e26e2151a97c655efa33d95fb76a4f5.png)
(2)如图2,点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4c2ad34391e098c6eb9a109019420a.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037b1a3ec2e37bbcb05d0a467efb511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c030d8a83f4587dcad4a889157bdf895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ae300e4ff3e89d0e1e5671eacd9585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a037b1a3ec2e37bbcb05d0a467efb511.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】“一带一路”让中国和世界更紧密,“中欧铁路”为了安全起见在某段铁路两旁安置了两座可旋转探照灯,如图1所示,灯A射线从
开始顺时针旋转至
便立即回转,灯B射线从
开始顺时针旋转至
便立即回转,两灯不停交叉照射巡视.若灯A转动的速度是每秒2度,灯B转动的速度是每秒1度,假定主道路是平行的,即
,且
.
_________;
(2)①若灯B射线先转动
,灯A射线才开始转动,在灯B射线到达
之前,设灯A转动t秒
,则_
________,
________;(用含t的式子表示)
②在①的条件下,若
,则
________秒.
(3)如图3,若两灯同时转动,在灯A射线到达
之前,若射出的光束交于点C,过C作
交
于点D,且
,则在转动过程中,请探究
与
的数量关系是否发生变化?若不变,请求出其数量关系;若改变,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ab569b7ea339dfb23f67ba78a8caa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fedab9fe1921f277cd6417bce91e6329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6f245379ae6b84110ea3b4536aa1777.png)
(2)①若灯B射线先转动
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bde8df702cc70de347860715172597a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068cd9d8285825f7c7eb51e3e0976598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/007663da0f349da4bdf9491ec1d1a1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f684565211b5b336cde4472947a5ad1.png)
②在①的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0d5b2be8ced596910ae063a375c0a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
(3)如图3,若两灯同时转动,在灯A射线到达
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6af38433c5ea5e25dce0ca0f3919c46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐2】已知,如图:射线
分别与直线
、
相交于
、
两点,
的角平分线与直线
相交于点
,射线
交
于点
,设
,
且
.
(1)
________,
________;直线
与
的位置关系是______;
(2)如图,若点
是射线
上任意一点,且
,试找出
与
之间存在一个什么确定的数量关系?并证明你的结论.
(3)若将图中的射线
绕着端点
逆时针方向旋转(如图)分别与
、
相交于点
和点
时,作
的角平分线
与射线
相交于点
,问在旋转的过程中
的值变不变?若不变,请求出其值;若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/94d5b88cdac96fd5aeb53283673fafe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c3fec00f352df8c5d9b9f8bb3672c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ca6d68113c1f6659de36ce10236c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e93d8d7b14e607676bcac7e39af4bf4.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ca3f0a4b2d06539e74594736881aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0d64d0dac186a32ca13d8d882c82c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3dbc8b821fb774b2869dadea079b691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e788a903eea2fd11781f0a9ce10f3000.png)
(3)若将图中的射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7688363f5ffff23a6193c7a8eee501c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6083cf3b0eb712e8f1788559a3ca998a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1703c824a1b95043221acc63daabe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea62c5f9d14620eb7bb86c4c1f61ac0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/3dc623d8-ec80-43de-b280-52aa3490e388.png?resizew=606)
您最近一年使用:0次