1 . 如图,
纸片的直角边AC落在直线l上,
,
,
,平面内一点O到直线l的距离为9,
纸片沿直线l左右移动,则
的最小值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/275c4dc4b6c9f95820ef6fe62a53facd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/5/933bd34f-8539-4eee-b445-142f8a071841.png?resizew=132)
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2020-12-10更新
|
2068次组卷
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5卷引用:江苏省常州市金坛区2020-2021学年八年级期中数学试题
江苏省常州市金坛区2020-2021学年八年级期中数学试题(已下线)期中检测卷(难)-2021-2022学年苏科版八年级数学上册同步单元检测江苏省苏州市太仓市四校联考2022-2023学年八年级上学期10月月考数学试题(已下线)第3章 勾股定理(基础、典型、易错、压轴)分类专项训练-2022-2023学年八年级数学上学期考试满分全攻略(苏科版)四川省成都市武侯区启明学校2023-2024学年八年级上学期期中数学试题
2 . 如图,在锐角
中,
,
,
的平分线交
于点
,
,
分别是
和
上的动点,则
的最小值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7502eee6f33e8c940dec63ab6473c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e95e98288acdd662de9a3dae1fcf0368.png)
![](https://img.xkw.com/dksih/QBM/2019/9/20/2294792983764992/2294820157734912/STEM/9674b046cdf24b0684afe89608bff785.png?resizew=137)
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3 . 如图,四边形 ABCD 中,AB⊥AD,BC⊥DC,点 M、N 分别是 AB、BC 边上的动点,∠B=56°.当△DMN 的周长最小时,则∠MDN 的度数是_____
![](https://img.xkw.com/dksih/QBM/2018/12/18/2099310117191680/2100886644219904/STEM/1349e2517eaa4d8aa47ec95af1ad183d.png?resizew=108)
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