如图,
,点
在直线
上,点
在直线
和
之间,
,
平分
.
![](https://img.xkw.com/dksih/QBM/2021/8/16/2787325542711296/2796515514761216/STEM/cd03efaaa03146579c28ea9de280501e.png?resizew=166)
![](https://img.xkw.com/dksih/QBM/2021/8/16/2787325542711296/2796515514761216/STEM/a5723e24bfe844fe967332327428a72b.png?resizew=193)
(1)求
的度数(用含
的式子表示);
(2)过点
作
交
的延长线于点
,作
的平分线
交
于点
,请在备用图中补全图形,猜想
与
的位置关系,并证明;
(3)将(2)中的“作
的平分线
交
于点
”改为“作射线
将
分为
两个部分,交
于点
”,其余条件不变,连接
,若
恰好平分
,请直接写出
__________(用含
的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/b21947cb6bc1277659f09a81a919bb75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb967f3188ad239a78047edf98458d6.png)
![](https://img.xkw.com/dksih/QBM/2021/8/16/2787325542711296/2796515514761216/STEM/cd03efaaa03146579c28ea9de280501e.png?resizew=166)
![](https://img.xkw.com/dksih/QBM/2021/8/16/2787325542711296/2796515514761216/STEM/a5723e24bfe844fe967332327428a72b.png?resizew=193)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf1667b21a273bf5dd007d65eeda7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4045ee3d20269a517d9adc1e84ef06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ebfd0a32a83d2562818f3ea1552289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(3)将(2)中的“作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ebfd0a32a83d2562818f3ea1552289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ebfd0a32a83d2562818f3ea1552289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5881f1ce9b4172ca346032d0fd1e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ddbaef2518ddf8b7a1e1e97faf74f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0d07cf5d60d68d306f4abac8ee2e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
20-21七年级下·辽宁大连·期中 查看更多[9]
辽宁省大连市甘井子区2020-2021学年七年级下学期期中数学试题(已下线)重难点01平行线(四种模型)-【满分全攻略】2022-2023学年七年级数学下学期核心考点+重难点讲练与测试(沪教版)(已下线)专题10 证明(考点串讲+八大类型)-2022-2023学年七年级数学下学期期中期末考点大串讲(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)(已下线)专题7.7 平行线中的四大经典模型-2023-2024学年八年级数学上册举一反三系列(北师大版)(已下线)专题5.4 平行线中的四大经典模型-2023-2024学年七年级数学上册举一反三系列(华东师大版)
更新时间:2021-08-29 11:08:17
|
相似题推荐
解答题-问答题
|
困难
(0.15)
名校
【推荐1】如图1,
,OM、ON分别为
和
的角平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/eba701e2-6008-4438-a61f-5010fa0e0e07.png?resizew=550)
(1)若
,则
°;
(2)如图2,
从第(1)问中的位置出发,绕点O逆时针以每秒
的速度旋转;当OC与OA重合时,
立即反向绕点O顺时针以每秒
的速度旋转,直到OC与OA互为反向延长线时停止运动.整个运动过程中,
的大小不变,OC旋转后的对应射线记为
,OD旋转后的对应射线记为
,
的角平分线记为
,
的角平分线记为OP.设运动时间为t秒.
①当
平分
时,求出对应的t的值;
②请问在整个运动过程中,是否存在某个时间段使得
的值不变?若存在,请直接写出这个定值及其对应的t的取值范围(包含运动的起止时间);若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31adc0e2d4aaf1a5e0dfe6e843c49dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/eba701e2-6008-4438-a61f-5010fa0e0e07.png?resizew=550)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12aa2bb3b37f2d56a287807700d04893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e090caa5f50c58d428f4e548ae1be1.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb204f42d5fb6cd55050a18cca2804b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc63679c80e6bd24f3a27763d545dcdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1586d3ecae6747312b7892bac03cf8bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142e0f0e25dc2ad81ec1a7ec6ed866b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b38d4adda7d8d17c365a54ba05cb98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b502efc5c360759bb9af805423e68dee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70b89ddabd85e5fd413fee5e85567907.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1586d3ecae6747312b7892bac03cf8bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/523db0449b22bfd4cb07ac1a1e254377.png)
②请问在整个运动过程中,是否存在某个时间段使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11056cb15792434d5d5f19b939e010d6.png)
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解答题-计算题
|
困难
(0.15)
名校
【推荐2】如图1所示,三角板
的直角边
靠在直线
上,其中
为直角,
,将三角板
以O为中心顺时针旋转
,射线
,射线
分别为
,
的角平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/e227c4c4-9d83-49bd-acce-45322501bb68.png?resizew=485)
(1)如图2所示,当
,
;
(2)如图3所示,在第(1)问的基础上,
,
分别为
,
内的射线,且
,试证明:
;
(3)当
,试猜想
与
的数量关系(直接写出所有情况).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201d3796ed9a29338aac25245a7c8e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3f9b99890e5650853f830170dccea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a327b3c7ec05a5da39530fd3b34379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201d3796ed9a29338aac25245a7c8e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73cc689ae54d9209aa1d03086f38945.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/dc9f91270ddbe1cf3c1362e1b95aee14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/e227c4c4-9d83-49bd-acce-45322501bb68.png?resizew=485)
(1)如图2所示,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f899a6812d83ec0b0994f4da95ce80f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5bc82bed7c3f094dbaed7019b4dcd6.png)
(2)如图3所示,在第(1)问的基础上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418ebb89d29f4f631b055c911e8d178a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9ec9a0b3a5aba39f61ac1ec5084a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d67f9077469c66494e628474ef671c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b2f111af5fd2d5ef1d31e2b652e850.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e6447fefbb5004673b718d6ebb1304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6ac2a955849e644d301ff1290277ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/843adec8fba1741ccb81a9017cfb815f.png)
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【推荐1】(1)问题提出:如图1,
中,
,则
的面积是_____________.
(2)新建模型:
如图2,四边形
中,E为对角线
的交点,已知
(
为
与
所夹的锐角).
①请求出四边形
的面积(用
表示).
②当
时,四边形
的面积是多少?
(3)模型应用:
如图3,四边形
中,
.已知
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc383bf94667925baf7561020816ad4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
(2)新建模型:
如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcd2518db9af38fdbd016e1f8fdebeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①请求出四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e8a14b5566cab5eb3a6c8cd06c76e6.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/917d8eea2d995241ff55686a18b97fa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)模型应用:
如图3,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22779f9567f1906cfde582ded66b60b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18444ec3e5e3b8a0cf488732c34866d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/e921ba1f-a82f-480f-8038-036642692b83.png?resizew=637)
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解答题-证明题
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困难
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【推荐2】如图,已知
和
均为等腰直角三角形,
,点
为
的中点,过点
与
平行的直线交射线
于点
.
(1)当
三点,
三点在同一直线上时(如图1),求证:
为
的中点;
(2)将图1中的
绕点
旋转,当
三点在同一直线上时(如图2),求证:
;
(3)将图1中
绕点
旋转到图3位置时,
四点在同一条直线上时,(2)中的结论是否仍成立?若成立,试证明之,若不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2036191be2322003aaee6bb411868327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43503bfc6f75d8e968eb5eb034a2db58.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/3fefaa4b-d3ca-4461-baed-10393696af56.png?resizew=525)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed3d8feb24b558778e25e0ddd5edadb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
(2)将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8d4559266f2f1887b621597ef5fc1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c033ae86abd2433e5a9b74ce298ad48.png)
(3)将图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce790ea8e72521a7d85fb9ea1f95f25.png)
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【推荐1】已知
,点
是直线
上一定点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/74b7a5e3-00f7-401d-928c-a1d4681ade88.png?resizew=591)
(1)如图1,现有一块含
角的直角三角板(
,
,
),将其点
固定在直线
上,并按图1位置摆放,使
,点
恰好落在射线
上,此时,
,求
的度数;
(2)现将射线
从图1的位置开始以每秒2度的速度绕点
顺时针旋转,转到与
重合时停止,三角板按图1摆放不动,设旋转时间为
秒,在旋转过程中,当
与三角板的一边平行时,求
的值;
(3)若将射线
从图1的位置开始以每秒2度的速度绕点
顺时针旋转,同时,将三角板
也从图1的位置开始以每秒4度的速度绕点
逆时针旋转,在旋转过程中,
的角平分线
与
的角平分线
交于点
.
①如图2,当
时,
________度;
②如图3,当
时,
________度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/947aed0181a8c0bd81c6ebeba8d1ddc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/74b7a5e3-00f7-401d-928c-a1d4681ade88.png?resizew=591)
(1)如图1,现有一块含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabecf66d94e4094f9cc46fd8ee050f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b82b637c7f0e7816afe89f98b56558c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f4fe9396bd6aaa6fa9fd315304a799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
(2)现将射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)若将射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0023e53eafba27ad50f9a9d3a4207d70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1703c6a49c511f8f82123ff561d8e91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1192fc83f2c50f64fcfa5c86f2a741e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b05714b8620eba2f56084a91442533.png)
②如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15111aee0de399f9e05379ae0a7781c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b05714b8620eba2f56084a91442533.png)
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解答题-计算题
|
困难
(0.15)
名校
【推荐2】已知,如图,
,直线
交
于点
,交
于点
,点
是线段
上一点,
,
分别在射线
,
上,连接
,
,
平分
,
平分
.
时,直接写出
的度数;
(2)如图2,求
与
之间的数量关系,并说明理由;
(3)如图3,在(1)问的条件下,若
,
,过点P作
交
的延长线于点
,将
绕点
顺时针旋转,速度为每秒
,直线
旋转后的对应直线为
,同时
绕点P逆时针旋转,速度为每秒
,
旋转后的对应三角形为
,当
首次落到
上时,整个运动停止,在此运动过程中,经过
秒后,
恰好平行于
的其中一条边,请直接写出所有满足条件的t的值,并选择其中一种情况书写计算过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a8cfb3747c454e0698e12857ffae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba6e1df63e02be9fcc4e027d2a0a6e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8db072e2b6104671b82f948012fb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3fd8ae390c2823c88f9d960ba6e99e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/769284088573642b72b6fd62eb807b34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c32805e421aec6bce3624baa0c954f1.png)
(2)如图2,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a298ed3325baafd125f688496fd52e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c32805e421aec6bce3624baa0c954f1.png)
(3)如图3,在(1)问的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da09f96fd13eea810fc07a7eddcff025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9580d1fc5886562246a8f20d8fd504d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02440b07d6dbfe3fbc27b7f78aba30ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8db072e2b6104671b82f948012fb45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/741a44528782580d24249e8075b8cd9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e8ac27d63ade4077fdcf7cf136cf71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb098c40d2d014760c515096af48196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb0aa8a61380228e285f3b5c7b74c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb098c40d2d014760c515096af48196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e39f0418fd7cd82ffe754e2c34fa2f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e8ac27d63ade4077fdcf7cf136cf71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e39f0418fd7cd82ffe754e2c34fa2f8.png)
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解答题-问答题
|
困难
(0.15)
名校
【推荐1】如图,在△ABC中,
,△ABC的两条角平分线BF、CE相交于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/1191a4a6-f8af-496b-ad39-3c706e461f62.png?resizew=156)
(1)
度.
(2)如图,平行四边形ABCD中,对角线
,在AD上截取AH=AB,连接BH交AC于点F,过点C作CE平分
交BH于点G.若
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/56ce440a-ec20-42d7-be48-1c0e3dc88508.png?resizew=212)
①求
的值.
②求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25daa6a88cd90fe8e5c532f21511ed91.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/1191a4a6-f8af-496b-ad39-3c706e461f62.png?resizew=156)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cd3c7ab70588e0e593db914ccc67d6.png)
(2)如图,平行四边形ABCD中,对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b968ee7efdb7727c62457a8b58b14ece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c484f79c69b61882f2b56f14514400f7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/56ce440a-ec20-42d7-be48-1c0e3dc88508.png?resizew=212)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7610b825747815dad099e6f2f842bd29.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f1aa12d8ed1e57c406136102e37d767.png)
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解答题-问答题
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【推荐2】如图①,
的角平分线BD、CE相交于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/29d3f1f5-0ce0-4ce6-ad4a-a6de16a94a39.png?resizew=383)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/a1d39339-bc98-4257-a945-9a1f447e8363.png?resizew=294)
(1)如果
,求
的度数;
(2)如图②,过P点作直线MN,分别交AB和AC于点M和N,且MN平行于BC,试求
的度数(用含
的代数式表示);
(3)将(2)中的直线MN绕点P旋转,分别交线段AB于点M(不与A、B重合),交直线AC于N,试探索
、
、
三者之间的数量关系,并说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/29d3f1f5-0ce0-4ce6-ad4a-a6de16a94a39.png?resizew=383)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/a1d39339-bc98-4257-a945-9a1f447e8363.png?resizew=294)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8793053fbb2ac5a3122b092a575124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
(2)如图②,过P点作直线MN,分别交AB和AC于点M和N,且MN平行于BC,试求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/346efe6e6eea884afa3b5dfd149ee807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(3)将(2)中的直线MN绕点P旋转,分别交线段AB于点M(不与A、B重合),交直线AC于N,试探索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55719858cd5fffccbd2933183a9f40f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82bf8f29e486ec388107b497520391c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
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解答题-证明题
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困难
(0.15)
【推荐3】已知:如图1,线段AB,CD相交于点O,连接AD,CB,我们把形如图1的图形称之为“8字形”.试解答下列问题:
(2)仔细观察,在图2中“8字形”的个数有____________个;
(3)在图2中,若∠D=40°,∠B=36°,∠DAB和∠BCD的平分线AP和CP相交于点P,并且与CD,AB分别相交于点M,N.利用(1)的结论,试求∠P的度数;
(4)如果图2中∠D和∠B为任意角时,其他条件不变,试问∠P与∠D,∠B之间存在着怎样的数量关系,并证明.
(2)仔细观察,在图2中“8字形”的个数有____________个;
(3)在图2中,若∠D=40°,∠B=36°,∠DAB和∠BCD的平分线AP和CP相交于点P,并且与CD,AB分别相交于点M,N.利用(1)的结论,试求∠P的度数;
(4)如果图2中∠D和∠B为任意角时,其他条件不变,试问∠P与∠D,∠B之间存在着怎样的数量关系,并证明.
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