如图,
为等腰
的高,
,
,E、F分别为线段
、
上的动点,且
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8817091d0f4b7d7ac6df560cb63c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f4d53985a03be1279af3cc6c5f6e89.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/9d5f4d03-8d70-4b38-9e48-f6cb21f9b180.png?resizew=139)
21-22七年级上·山东济宁·期末 查看更多[2]
山东省济宁市任城区济宁学院附属中学2021-2022学年七年级上学期期末数学试题(五四学制)(已下线)专题1.27 三角形的证明(最值问题)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(北师大版)
更新时间:2023-02-03 09:32:36
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【推荐1】如图,等腰
的底边
的长为
,面积是
,腰
的垂直平分线
分别交
,
于点E,F,若D为边
的中点,M为线段
上一动点,则
周长的最小值为_____
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】如图,在
中,
.如果在三角形内部有一条动线段
,且
,则
的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262ddd1b80bf19b8e119f771d9c18fb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f792b750e5a53cd089885ebe02c470b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c096bd244d7e30e8ef26fb5278aac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21644282a2e5bde18c3e5cc70b0bf4eb.png)
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【推荐1】如图,在
中,
,D为
上的一点,
,在
的右侧作
,使得
,连接
交
于点O,若
,则
的度数为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4dbea6a5faecdd8f6c06cf9fd43a90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f4568d291d4fbd99b687223ca9a34a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6978db667ebc639dbea4708609cbedb.png)
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【推荐2】如图,在矩形
中,
,点
,
为直线
上的两个动点,且
,将线段
关于
翻折得线段
,连接
.当线段
的长度最小时,
的度数为________ 度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e252f4bc1975af1c7a775b46fab64ee5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
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【推荐1】如图,
为锐角
的外接圆,点
在
上,
交
于点
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,连接
,设
.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa0f4484f901bb727fbeae1a044d714.png)
__________ .(用含
的代数式表示)
(2)若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a008bc24d56d15759f0a67f39b6fb063.png)
____________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f33645efd57b8f0075c3779127fac6b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec66384de001ccfd86e935ddcfe1033d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa0f4484f901bb727fbeae1a044d714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df9b6e6c12f100d3629c2b586dd69c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a568d41b435c1fb46d5578d7e38ff2a.png)
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【推荐2】如图,在
中,
,
和
的平分线分别交
于点G、F,若
,
,求
=___________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d0e0298a31f910b10b186456554a450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e18d177c04f631fd1c7a60188cd5b061.png)
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【推荐1】如图,已知菱形
的边长为
,对角线
,
相交于点
,点
,
分别是边
,
上的动点,
,连接
,
.①
是等边三角形;②
的最小值是
;③当
最小时,
;④当
时,
.其中正确的结论有____________ (填写所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f20b81526b746d94f6ea1fabba62162.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e23b39f0071d7e208d13ddbc54e4dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a89efb10e95245a41f6c7a80189528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d25a5eb0363cdacd9afe9aacd868c6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/31/79ea2770-5963-4935-b0a5-419935c86098.png?resizew=218)
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【推荐2】如图,已知四边形
中,
,点
分别是边
上的两个动点,且
,过点B作
于G,连接
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的最小值是_______ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5e08ce4a6ff34c0b2c22e736b5df378.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b68efd4fc0feb83f326a563f0ceaba06.png)
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