名校
1 . 已知长方形纸片
,点
和点
分别在边
和
上,且
,点
和点
分别是边
和
上的动点,现将点
,
,
,
分别沿
,
折叠至点
,
,
,
,若
,则
的度数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e81132e000c11f3b24f98c54882ec5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0e895fbdb6f6759a8346ad7ea7f6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb34a7abb4b6269fbbec581df20dd3c8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/31/2a3de6b3-e9e5-42ed-90ac-2025aa0b241f.png?resizew=154)
您最近一年使用:0次
2 . 在
中,
,
分别是
和
上的点,
.过点
作
交
于点
,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/7cac1782-b3f5-44d1-a372-44c14ee69638.png?resizew=194)
(1)如图①,若
,求证:
;
(2)在(1)的条件下,若
,
,求
的长;
(3)如图②,若
,则(1)中的结论是否成立?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a49fe8135213e54a758b2c2aa82049b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d354155f71a1736c1c9186168695edd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9f10d4ebbc23dacfde5ac5854eed5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/7cac1782-b3f5-44d1-a372-44c14ee69638.png?resizew=194)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7595bdaea3dfa548c0fcfe3708387476.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5e8fe2cf6bd5d0ba5dfeb0697a90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3362a45b72536c714c5107b0ae94f1c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
(3)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d15b7c09aac2543b8615aca6b62ee36d.png)
您最近一年使用:0次
2023-12-20更新
|
135次组卷
|
2卷引用:安徽省淮北市五校联考2023-2024学年八年级上学期月考数学试题
3 . 如图,点C是
中
边上的高线的延长线与外角
的平分线
所在直线的交点,有以下几个命题:①若
,
,则四边形
的面积为60;②若
,则
;③若
,则
;④若
,则
,其中为真命题的是( )
![](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/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0916a72324358517874dc3c22bc1a7bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5fc4ad65b723b6a8da4c8dac154e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66deac0249cd080da9016f938c40c3b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc95dea8fedc9b85204ce9cfd1fcbc0a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/12/7d3e9d2c-c188-49b8-bd5f-219840299543.png?resizew=290)
A.①②③ | B.②③④ | C.①④ | D.②④ |
您最近一年使用:0次
名校
4 . 已知直线
分别交直线
于点
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ff3d44da99d5841025133bada10e48.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/b05fa7fa-5115-4eb9-8a1c-9b1c9a7f03be.png?resizew=426)
(1)如图1,求证:
;
(2)如图2,点
分别在射线
上,点
分别在射线
上,连接
,且
,分别延长
交于点
,求证:
;
(3)如图3,在(2)的条件下,连接
平分
,且
平分
,若
,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0f3ed5ea1cf0fa8f7c6be46cd5fa057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ff3d44da99d5841025133bada10e48.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/b05fa7fa-5115-4eb9-8a1c-9b1c9a7f03be.png?resizew=426)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a11523a3eb88e81ac3fac4bb5e193ae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7eff5a918f2b39e5ae9977e3f78139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8032431bcb109322c74f571ad189beca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4eaa7bad3cd00418e95aa2c78ae7f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8032431bcb109322c74f571ad189beca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31e713f9b76264946f017625edee4b2.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53880d9434c16b92bd803bb03d8a808b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74e5014645768575aac2578f228f8401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb34a7abb4b6269fbbec581df20dd3c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec75d1304db20b8b6f8f0dade9f2b83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/def1401536cf4dcf4f43e92692714f7b.png)
您最近一年使用:0次
2023-04-28更新
|
331次组卷
|
3卷引用:湖南省长沙市雅境中学2022-2023学年七年级下学期第三次月考数学试题
5 . 将一块三角板
(
,
)按如图所示方式放置,使顶点C落在
的边
上,
.经过点D画直线
,交
边于点M.
.
①求
的度数;
②试说明:
平分
;
(2)如图2,
平分
,交
边于点F,试探索
与
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f864b11496cc738c29a737267cfc07cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0af13586681abc06d8b41fab349294ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1225a8f430f7dad70b0c6173d3b6a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/521b3fb30603fe8865e32595630ed674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393d99d8768a1bdc0db594a11ad815fd.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b55b502f406c3525ce81b60bdfdc11e.png)
②试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474e47a4679cace57ffd2b870f5b13a2.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ef3d782c9fa988fd3690ca69a6dd21c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97285f9b02878e22a071e97fdb3f8a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e1626889d3b15751a440219b712dc7.png)
您最近一年使用:0次
2023-02-28更新
|
955次组卷
|
7卷引用:吉林省吉林市2022-2023学年七年下学期第一次月考数学试题
6 . (1)如图1,已知,在
中,
,
平分
,
平分
,过点
作
,分别交
、
于
、
两点,则图中共有________个等腰三角形:
与
、
之间的数量关系是________,
的周长是________.
(2)如图2,若将(1)中“
中,
”改为“若
为不等边三角形,
,
”其余条件不变,则图中共有________个等腰三角形;
与
、
之间的数量关系是什么?证明你的结论,并求出
的周长.
(3)已知:如图3,
在
外,
,且
平分
,
平分
的外角
,过点
作
,分别交
、
于
、
两点,则
与
、
之间又有何数量关系呢?写出结论并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eeb0c8df3d8c5260768c5e407b3583a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
(2)如图2,若将(1)中“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eeb0c8df3d8c5260768c5e407b3583a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
(3)已知:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abcb980da8e86b4cfd322616dc84fc6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d890499dca9a8ef30addafe41d6e771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/fb938167-533b-4acc-849a-819ea2baae88.png?resizew=505)
您最近一年使用:0次
7 . 如图,
中,
是它的角平分线,
是
上的一点,
交
与
,
交
与
.求证:
到
的距离与
到
的距离相等.
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68741489eb6ea96a8a24c6aa46f32c00.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/b170b02e-0450-4a86-bf8b-ffa68941dd83.png?resizew=224)
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2022-12-07更新
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78次组卷
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2卷引用:广东省江门市新会区尚雅中学2022-2023学年八年级上学期第一次月考数学试题
8 . 如图,在平面直角坐标系中,若A(m﹣6,0),B(0,m+1),且OA=OB+1.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/390ac644-ad00-43ca-8eb9-94dc15788d25.png?resizew=415)
(1)求点A、B的坐标;
(2)将线段AB向右平移2个单位长度至CD,且点A对应点为点C,点B的对应点为点D,线段CD交x轴于H点,DE⊥x轴于点E,在y轴上是否存在一点P,使
,若存在,求出点P的坐标;
(3)在(2)的条件下,点M在x轴上点A的左侧,∠MAB与∠CHO的平分线交于点Q,求∠Q的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/390ac644-ad00-43ca-8eb9-94dc15788d25.png?resizew=415)
(1)求点A、B的坐标;
(2)将线段AB向右平移2个单位长度至CD,且点A对应点为点C,点B的对应点为点D,线段CD交x轴于H点,DE⊥x轴于点E,在y轴上是否存在一点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/160f6f827d7a1635cf11fa54ea0450d1.png)
(3)在(2)的条件下,点M在x轴上点A的左侧,∠MAB与∠CHO的平分线交于点Q,求∠Q的度数.
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9 . 如图,点A、B、C、D在网格中小正方形的顶点处,AD与BC相交于点O,小正方形的边长为1,则AO的长等于_______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/b4ef8deb-5075-49a0-9352-771ff35412da.png?resizew=138)
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2022-10-03更新
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6卷引用:吉林省长春市朝阳区长春力旺实验初级中学2022-2023学年九年级上学期9月月考数学试题
吉林省长春市朝阳区长春力旺实验初级中学2022-2023学年九年级上学期9月月考数学试题江苏省南通市如皋市如皋初级中学2023-2024学年九年级上学期第二次月考数学试题(已下线)专题9.31 中心对称图形——平行四边形(全章复习与巩固)(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(苏科版)(已下线)专题 18.60 平行四边形(全章复习与巩固)(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)2023年江苏省苏州市校张家港市梁丰初级中学中考二模数学试题2023年江苏省苏州市张家港市梁丰初级中学中考数学二模模拟试题
10 . (1)光线从空气中射入水中会产生折射现象,同时光线从水中射入空气中也会产生折射现象,如图1,光线a从空气中射入水中,再从水中射入空气中,形成光线b,根据光学知识有∠1=∠2,∠3=∠4,请判断光线a与光线b是否平行,并说明理由.
(2)光线照射到镜面会产生反射现象,由光学知识,入射光线与镜面的夹角与反射光线与镜面的夹角相等,如图2有一口井,已知入射光线a与水平线OC的夹角为42°,问如何放置平面镜MN,可使反射光线b正好垂直照射到井底?(即求MN与水平线的夹角)
(3)如图3,直线EF上有两点A、C,分别引两条射线AB、CD.∠BAF=110°,∠DCF=60°,射线AB、CD分别绕A点,C点以1度/秒和3度/秒的速度同时顺时针转动,设时间为t,在射线CD转动一周的时间内,是否存在某时刻,使得CD与AB平行?若存在,求出所有满足条件的时间t.
(2)光线照射到镜面会产生反射现象,由光学知识,入射光线与镜面的夹角与反射光线与镜面的夹角相等,如图2有一口井,已知入射光线a与水平线OC的夹角为42°,问如何放置平面镜MN,可使反射光线b正好垂直照射到井底?(即求MN与水平线的夹角)
(3)如图3,直线EF上有两点A、C,分别引两条射线AB、CD.∠BAF=110°,∠DCF=60°,射线AB、CD分别绕A点,C点以1度/秒和3度/秒的速度同时顺时针转动,设时间为t,在射线CD转动一周的时间内,是否存在某时刻,使得CD与AB平行?若存在,求出所有满足条件的时间t.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/5/d5220998-542f-4b09-9ed2-f09431ff8b62.png?resizew=441)
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2022-09-04更新
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5卷引用:江苏省江阴市周庄中学2021-2022学年七年级下学期3月限时作业数学试题
江苏省江阴市周庄中学2021-2022学年七年级下学期3月限时作业数学试题福建省厦门市金林湾实验学校2023-2024学年七年级下学期第一次月考数学试题(已下线)7.3 平行线的判定-2022-2023学年八年级数学上册课后培优分级练(北师大版)(已下线)第1章 平行线 章末检测卷-2022-2023学年七年级数学下册重难题型全归纳及技巧提升专项精练(浙教版)(已下线)江苏七年级下期中真题精选(常考60题专练)(范围:第7章~第9章)-【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(苏科版)