已知,在平面直角坐标系中,
轴于点B,点
满足
,平移线段
使点A与原点重合,点B的对应点为点C.
_______,
_______,点C坐标为________;
(2)如图1,点
是线段
上一个动点.连接
,利用
,
,
的面积关系,可以得到m、n满足一个固定的关系式,请求出这个关系式.
(3)如图2,以
为边作
,交线段
于点G,E是线段
上一动点,连接
交
于点F,当点E在线段
上运动过程中,
的值是否发生变化?若变化请说明理由,若不变,求出其值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24624dffd30b66a5e4de57362b32b2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8530bca5123179cfede86d03738495e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0587510346db5f783857233045d238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/518dfce0a9aab04171383586c5077146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb49c1fd097c5aafc0c9080449f5fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7189182cc23d759be2764d141952737b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
(3)如图2,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76b56c008654aa3826dc9ad4d7c560de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/469cde3fa2f4bb3e815c0a29507f5eaa.png)
22-23七年级下·湖北孝感·期中 查看更多[3]
湖北省孝感市孝昌县2022-2023学年七年级下学期4月期中数学试题湖北省黄冈师范学院附属武穴实验中学2022--2023学年七年级下学期期中考试数学试卷(已下线)专题10七年级期中压轴题精选-【好题汇编】备战2023-2024学年七年级数学下学期期中真题分类汇编(人教版,湖北专用)
更新时间:2023-04-24 19:00:28
|
【知识点】 三角形的外角的定义及性质解读
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解答题-证明题
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较难
(0.4)
名校
【推荐1】△ABC为等边三角形,点D和E分别在AB和AC上,连接CD,BE交于点F,AD=CE.
(1)如图1,求∠BFD的度数;
(2)如图2,过点A作AG∥BE,交CD延长线于点G,求证:BF=GF;
(3)如图3,在(2)的条件下,在AE上取点K,连接DK,延长BE和DK交于点M,若KD=KC,FM=2,BE=7,求CG的长.
(1)如图1,求∠BFD的度数;
(2)如图2,过点A作AG∥BE,交CD延长线于点G,求证:BF=GF;
(3)如图3,在(2)的条件下,在AE上取点K,连接DK,延长BE和DK交于点M,若KD=KC,FM=2,BE=7,求CG的长.
![](https://img.xkw.com/dksih/QBM/2021/12/2/2863870678654976/2864417288691712/STEM/8aea30e2-320c-429f-9430-65e08280dd5f.png?resizew=578)
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【推荐2】如图1,在等腰三角形
中,
点
分别在边
上,
连接
点
分别为
的中点.
(1)观察猜想
图1中,线段
的数量关系是____,
的大小为_____;
(2)探究证明
把
绕点
顺时针方向旋转到如图2所示的位置,连接
判断
的形状,并说明理由;
(3)拓展延伸
把
绕点
在平面内自由旋转,若
,请求出
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5dd8e27855905501831d7eb1bef2cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/265bae0409951174f1d3982a065dfdca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17c6391551862185369f6bcc6a899aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60c6db49930fbbab66b1fab54f5449e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/073620b7f21d6ed2fac08cf82e009a4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/18/0e5c99bc-7517-487f-941c-f023c30dffad.png?resizew=401)
(1)观察猜想
图1中,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f8858a7d97b7a907daa4e573cbb4f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d7af76a3b1a09c6080fd5b39333dca.png)
(2)探究证明
把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb32e0a5815cc218b6f88229bfc76939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23b488f961d9fde37feb7f5c497c0d9.png)
(3)拓展延伸
把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bda38e0d8eda453da33fa89b5fb65079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23b488f961d9fde37feb7f5c497c0d9.png)
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