数学模型可以用来解决一类问题,是数学应用的基本途径,通过猜想探究图形的变化规律,最终可以获得宝贵的数学经验,并将其运用到更广阔的数学天地.如图1,在等边
中,点
,
分别在边
,
上,
,连接
,
,点
,
,
分别是
,
,
的中点.
图1中
的形状是______;
(2)探究证明
把
绕点A逆时针方向旋转到图2的位置,
的形状是否发生改变?并说明理由.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
(2)探究证明
把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
23-24九年级上·云南昆明·期末 查看更多[2]
云南省昆明市盘龙区2023-2024学年九年级上学期期末数学试题(已下线)专题05 中点模型之中位线、斜边中线、中点四边形期末真题汇编【六大题型+优选提升题】-备战2023-2024学年八年级数学下学期期末真题分类汇编(人教版)
更新时间:2024-01-23 13:12:44
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解答题-问答题
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适中
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【推荐1】如图,点
在
上,
和
都是等边三角形.猜想:
三条线段之间的关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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名校
【推荐2】已知△ABC中,AB=AC,点D为BC上一点,∠BAC=∠DAE,AD=AE,连接CE:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/78c9b896-d37f-4ed8-99cb-531c8cd88334.png?resizew=413)
(1)如图1,求证:CE+CD=BC;
(2)当∠BAE﹣∠ADC=90°时,如图2,求∠B的度数;
(3)在(2)的条件下,点G为AC的中点,连接BG,∠BAD=∠ABG,若AE=1,求BG的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/78c9b896-d37f-4ed8-99cb-531c8cd88334.png?resizew=413)
(1)如图1,求证:CE+CD=BC;
(2)当∠BAE﹣∠ADC=90°时,如图2,求∠B的度数;
(3)在(2)的条件下,点G为AC的中点,连接BG,∠BAD=∠ABG,若AE=1,求BG的长.
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解答题-问答题
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名校
【推荐1】已知,如图,点P是等边△ABC内一点,∠APB=112°,如果把△APB绕点A旋转,使点B与点C重合,此时点P落在点
处,求
的度数.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ddde27e55c4a70985232108771cdc6.png)
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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,在矩形
中,
,对角线
,
相交于点O,
垂直平分
于点E,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
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解答题-证明题
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适中
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【推荐1】已知:四边形ABCD, E、F、G、H是各边中点.猜想四边形EFGH是什么图形? 并证明你的猜想.
![](https://img.xkw.com/dksih/QBM/2018/5/8/1940883419594752/1941828602986496/STEM/7aefb119498d4349adffcde137f6cc7b.png?resizew=237)
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解答题-证明题
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【推荐2】如图,
是半圆
的直径,点
是半圆上不与点
、
重合的一个动点,延长
到点
,使
,
是
的中点,连接
、
.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96645a3530e72d5d733d2c72147d340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7465c3848d832ec772b6c1510d61aa59.png)
;
(2)连接
,当四边形
是菱形时,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89cd4aa28b07f2ff7cf0e1b66e67f6c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/24/c55b9973-b3d9-449c-9378-d6bd2c6d5ca7.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96645a3530e72d5d733d2c72147d340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7465c3848d832ec772b6c1510d61aa59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5dd6306e00de2ae82d6605308792db.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93f597d8a41738d6496166d23f7b78a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09bebb16c0ffc99a945619ae0986cadd.png)
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