如图,∠1=30°,∠B=60°,AB⊥AC.
(1)∠DAB+∠B等于多少度?
(2)AD与BC平行吗?AB与CD平行吗?
(1)∠DAB+∠B等于多少度?
(2)AD与BC平行吗?AB与CD平行吗?
![](https://img.xkw.com/dksih/QBM/2018/4/24/1930826880065536/1937345975648256/STEM/b6f00d6e-9192-44f0-a0ac-7ff54e275d73.png?resizew=231)
17-18七年级下·全国·课后作业 查看更多[12]
人教版七年级数学下册:5.2.2平行线的判定同步测试黑龙江大庆第十四中学2017~2018学年七年级下学期期中模拟数学试卷人教版数学七年级下册第5章 相交线与平行线 单元达标训练人教版数学七年级下册 5.2 平行线及其判定 同步训练人教版数学七年级下册第五章 相交线与平行线 单元综合提升卷人教版七年级下册数学课堂练习卷: 5.2平行线及其判定四川省广安区肖溪镇初级中学 2018-2019学年七年级第二学期下册期中数学试题山东省青岛市第四中学2019-2020学年七年级下学期3月月考数学试题浙江省嘉兴市清河中学2019-2020学年七年级下学期期中数学试题湖北省武汉市蔡甸区2019-2020学年七年级下学期期中数学试题(已下线)【人教版课时练习】七年级下册数学第五章相交线和平行线 复习题5湖北省荆门市外语学校2023-2024学年七年级下学期期中数学试题
更新时间:2018-05-03 14:03:23
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相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】问题提出:射到平面镜上的光线(入射光线)和变向后的光线(反射光线)与平面镜所夹的角相等.如图1,
是平面镜,若入射光线
与水平镜面夹角为
,反射光线
与水平镜面夹角为
,则
.
,则直接写出
的大小.
(2)数学探究:如图2,有两块平面镜
,
,且
,入射光线
经过两次反射,得到反射光线
.
完成如下问题:
①若
,直接写出
的度数.
②求证:
.
拓展运用:有两块平面镜
,
,入射光线
经过两次反射,得到反射光线
,光线
与
相交于点
,如图3,图4.若
,
.直接写出
,
满足的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdcf6bcc8458140c579219e5dd91efba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
(2)数学探究:如图2,有两块平面镜
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0b06dc01c30d13f64be2ac6a1d811e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
完成如下问题:
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f586d178cb0f69dd900967766ba8950a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4c3c0a34dc21292fa32befd58d8f82.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
拓展运用:有两块平面镜
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.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/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/6b5632d211b06594939fddc35a28b66e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf49467debcd06abf3d4d056b5a66d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图
,
平分
,
三点共线
,
,
,求
.
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718821125554176/2788723319627776/STEM/ccae85ef-723c-4ac5-80d7-fd2dc98e598b.png?resizew=233)
解:
平分
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14f918e53b9246c548283901ab2cf212.png)
(______)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c1e93108acf1f678cc26c0d9959eca.png)
∴______=
(______)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e3e7c437e01b65acd2e871b9b7abb9.png)
______°
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bb783b248e4ec27f4eeb646107678c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9be23a8726c88cb31713c46f0fa1f25.png)
(______)
(______)
(______)
______°
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7915e42fb51e0e5d082d01768618e3e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14f918e53b9246c548283901ab2cf212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa11013a8c200f32789db47e0343535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5f129d1d3843ba2ce6b4e9b8209691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adcae9d00980803e5955228d1e217abe.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718821125554176/2788723319627776/STEM/ccae85ef-723c-4ac5-80d7-fd2dc98e598b.png?resizew=233)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a669f6cf2d09a7b020988c8e24dc33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14f918e53b9246c548283901ab2cf212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4683e0dfbd288780f0f31364be8858ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c1e93108acf1f678cc26c0d9959eca.png)
∴______=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b177008fe21567efaaa9fbaccbde86aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51e3e7c437e01b65acd2e871b9b7abb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7abbb37e84d167baa7f9d01f542851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bb783b248e4ec27f4eeb646107678c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9be23a8726c88cb31713c46f0fa1f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfdc024e46f8250072b82918bd1c234c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c8addd867118a1212fceee7eaa6c5b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30503527b0c7579c5348596e02abeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39c031eb6091e111b65df5218963cf9.png)
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解答题-问答题
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适中
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名校
【推荐1】如图,在三角形ABC中,D,E,F分别是三边上的点,且DE平分∠ADF,∠ADF=2∠DFB.
(1)判断DE与BC是否平行,并说明理由.
(2)若EF∥AB,∠DFE=3∠CFE,求∠ADE的度数.
(1)判断DE与BC是否平行,并说明理由.
(2)若EF∥AB,∠DFE=3∠CFE,求∠ADE的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/17/1aa0d692-e491-4cac-9d8e-6d409ca89be7.png?resizew=203)
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解答题-问答题
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适中
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【推荐2】如图,直线
,直线
,
被直线
所截,
平分
,
平分
.
![](https://img.xkw.com/dksih/QBM/2022/8/31/3056348601974784/3070047166570496/STEM/e9a7b79cb7b4428d9a7930289e56c87f.png?resizew=170)
(1)若
,求
的度数;
(2)在三角形
中,已知
,试判断
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2ee75a234ac05a3225e49ddd8c5065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c19410c7abeae002ca97cfad4c791f.png)
![](https://img.xkw.com/dksih/QBM/2022/8/31/3056348601974784/3070047166570496/STEM/e9a7b79cb7b4428d9a7930289e56c87f.png?resizew=170)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db22fd88641ac3c3d75573fd8d715271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ca0ea573af39647bbb44977ed1eeb2.png)
(2)在三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ce1477ce215051fe313a12e5d99f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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解答题-证明题
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适中
(0.65)
【推荐3】已知:如图,直线
与
分别相交于点E,F.
,
,则
和
的位置关系为______;
(2)在(1)的情况下,若点P是平面内的一个动点,连接
,探索
三个角之间的关系:
①问题发现:当点P在图2的位置时,可得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7440a891407327e75ea46a522eaf967.png)
请阅读下面的解答过程,并填空(理由或数学式):
解:如图2,过点P作
,
则
(______).
∵
(已知),
(作图),
∴
(______).
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743229db6c9a9a0bbf7d242ffdbd41ef.png)
∴
.
即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7440a891407327e75ea46a522eaf967.png)
②拓展探究:当点P在图3的位置时,求
三个角之间有何数量关系;
③解决问题:当点P在图4的位置时,请直接写出
三个角之间的关系.
![](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/582090ead5f50c76d39814bcb7606bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9a3b8dc17cd0f4ca5a45b7e301edec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)在(1)的情况下,若点P是平面内的一个动点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c24b30d0775e565ad5aed48400c9f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1df886300e854c5172799d24a9db792.png)
①问题发现:当点P在图2的位置时,可得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7440a891407327e75ea46a522eaf967.png)
请阅读下面的解答过程,并填空(理由或数学式):
解:如图2,过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc9f041724e7fa6b08c717de02fc9d.png)
则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8127ea8d23aa084f18ebee511a063f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc9f041724e7fa6b08c717de02fc9d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c5b2fedc3f050c6c0abc00a4c9094a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/743229db6c9a9a0bbf7d242ffdbd41ef.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe50f7b70d0c03d8b62aeab8582544f.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7440a891407327e75ea46a522eaf967.png)
②拓展探究:当点P在图3的位置时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1df886300e854c5172799d24a9db792.png)
③解决问题:当点P在图4的位置时,请
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1df886300e854c5172799d24a9db792.png)
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