如图,点E,F分别在
上,
,垂足为点O,
,
,试说明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a598a35e6a4bfb3a5f08b55b70bdc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ea5d581e0305727d96bcaf3a1d4048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f24a813ce182e99b7f9a6d6e2894d61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
21-22七年级下·甘肃兰州·期中 查看更多[16]
甘肃省兰州市城关区兰州树人中学2021-2022学年七年级下学期期中数学试题山东省青岛市市南区青岛市第五十七中学2021-2022学年七年级下学期期中数学试题(已下线)数学(人教版A卷)-学易金卷:2022-2023学年七年级下学期期中考前必刷卷(安徽专用)重庆十一中教育集团初2022-2023学年七年级下学期期中数学试题河南省三门峡市渑池县韶州中学2021-2022学年七年级下学期第一次月考数学试题广东省河源市龙川县2022-2023学年七年级下学期期中数学试题陕西省咸阳市兴平市2023-2024学年八年级上学期期末数学试题吉林省白城市大安市乐胜乡中学校2023-2024学年七年级下学期第一次月考数学试题(已下线)第一单元 平行线达标测试卷-2023-2024学年七年级数学下册《知识解读·题型专练》(浙教版)(已下线)专题01 相交线与平行线(考点清单,5个概念2个判定2个性质2种方法2种思想)-2023-2024学年七年级数学下学期期中考点大串讲(人教版)山东省济南市历下区2023-2024学年下学期七年级数学期中质量检测模拟试题四川省广安市岳池县城关中学校2024年七年级下学期4月月考数学试题山东省菏泽市鄄城县2023-2024学年七年级下学期期中数学试题山东省德州市陵城区2023-2024学年七年级下学期期中数学试题(已下线)专题01 相交线与平行线(知识串讲+热考题型+真题训练)-2023-2024学年七年级数学下学期期中期末考点归纳满分攻略讲练(人教版)(已下线)第2章相交线与平行线 全章高频考点专练(4个概念2个判定2个性质2个方法2种思想专练)原卷版
更新时间:2023-03-25 11:08:39
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【推荐1】阅读并填空:如图,
,
,垂足分别为D、F,
.请说明
的理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/4adf29a3-5df5-4ed2-9a3b-b091e6539784.png?resizew=276)
解:因为
,
(已知),
所以
(______).
所以
(______).
所以
(______).
又因为
(已知),
所以
(同角的补角相等).
所以______
______(内错角相等,两直线平行).
所以
(______).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4d67aa2a39c15abaa0cbc09432f1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9daaad8d1f1b0217dcef356a991289.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/4adf29a3-5df5-4ed2-9a3b-b091e6539784.png?resizew=276)
解:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ed4f5044411e6dd513c3237541d632e.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfffc4b756bd8b93304efc27c3d7b41.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1717b5311ed602f1730e86d9322647.png)
又因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4d67aa2a39c15abaa0cbc09432f1fb.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50ce9ef89a466df68124a1dccff5663.png)
所以______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
所以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e9daaad8d1f1b0217dcef356a991289.png)
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名校
【推荐2】根据提示填上每步推理的依据:
如图:已知,
于点F,
于点M,
,
,求证:
.
证明:∵
,
,
∴
(__________),
∴
(__________),
∴
____(__________),
∵
(已知),
∴
______(__________),
∴
(内错角相等,两直线平行),
∴
(_______),
∵
(已知),
∴
(等量代换),
∴
(____________).
如图:已知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22bebf68c92f3fc0de750330b001df56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779269f1a17e5eccd41f9f5d64b29e27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e52060a3cb5cde73c28264f4e08a3e2.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22bebf68c92f3fc0de750330b001df56.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4878cb39082aab927033779560f7c5b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a2e397c2b87dde8739cc6bffa08ee7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1503237215798ab4694f90a3a5390787.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/207c37b4e9eb8c53fd2ae13c7afe92dc.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7475ed82abed407ad2ff74cf3f59600.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f1f20ef6f3cdd9629aa7b623885972.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/779269f1a17e5eccd41f9f5d64b29e27.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fa0e2daa1cdcd0cfb30627936ea70e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e52060a3cb5cde73c28264f4e08a3e2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/497fe5fd-f65b-45f0-a429-ee3b25667612.png?resizew=160)
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解答题-证明题
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【推荐1】如图,在平面直角坐标系中,
轴,点A的坐标为
,点B在y轴右侧,点C的坐标为
.
![](https://img.xkw.com/dksih/QBM/2022/5/4/2979256516771840/2997562547658752/STEM/c8c7237d-fa90-424c-99bf-dc44dbd15088.png?resizew=250)
(1)若
,则点B的坐标为________;
(2)连接
、
,若
平分
,
平分
,且
,求证:
;
(3)在直线
上是否存在一点P,使得
的面积为6,若存在,求出此时点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf79a784c60e75896ea9ca560fb5d687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc30165c18de623d0a3efb961e606d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5030685d4bfdaba51d78d4678f3e101c.png)
![](https://img.xkw.com/dksih/QBM/2022/5/4/2979256516771840/2997562547658752/STEM/c8c7237d-fa90-424c-99bf-dc44dbd15088.png?resizew=250)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/412077581229ebf492517862e12cff6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
(3)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
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【推荐2】如图,已知∠ABC+∠C=180°,∠A=∠C.试说明∠E=∠AFE.
解:∵∠ABC+∠C=180°
∴
(________),
∴ ∠ABE=∠C(________),
又∵________,
∴ ∠ABE=∠A(________),
∴________,
∴ ∠E=∠AFE(________).
解:∵∠ABC+∠C=180°
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
∴ ∠ABE=∠C(________),
又∵________,
∴ ∠ABE=∠A(________),
∴________,
∴ ∠E=∠AFE(________).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/3463d35c-6296-488d-8d3f-6cc8bbf2c032.png?resizew=163)
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