如图,正方形
的面积为24,
是等边三角形,点
在正方形
内,在对角线
上有一点
,使
的和最小,则这个最小值为 ( )
![](https://img.xkw.com/dksih/QBM/2021/6/25/2750492536053760/2750789242249216/STEM/f1d14bb1d6d24fc0b8a463fe51048e22.png?resizew=125)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f3a30d63fde5623d018b4a77231967.png)
![](https://img.xkw.com/dksih/QBM/2021/6/25/2750492536053760/2750789242249216/STEM/f1d14bb1d6d24fc0b8a463fe51048e22.png?resizew=125)
A.![]() | B.![]() | C.3 | D.![]() |
更新时间:2021-07-03 08:57:11
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【推荐1】如图,牧童在A处放牛,其家在B处,A,B到海岸的距离分别为AC和BD,且AC=BD,若点A到河岸CD的中点的距离为500米,则牧童从A处把牛牵到河边饮水再回家,最短距离是( )
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【推荐2】如图,四边形
是菱形,点M,N都在
的延长线上,且
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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A.![]() | B.6 | C.![]() | D.![]() |
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【推荐1】宽与长的比是
的矩形叫黄金矩形.心理测试表明:黄金矩形令人赏心悦目,它给我们以协调、匀称的美感.现在,按照如下的步骤作图:
第一步:作一个正方形
;
第二步:分别取
、
的中点
、
,连接
:
第三步:以点
为圆心,
长为半径画弧,交
的延长线于点
;
第四步:过点
作
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的延长线于
.
则所作图形中是黄金矩形的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
第一步:作一个正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
第二步:分别取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
第三步:以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a8cfb3747c454e0698e12857ffae8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
第四步:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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则所作图形中是黄金矩形的是( )
A.矩形![]() | B.矩形![]() | C.矩形![]() | D.矩形![]() ![]() |
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【推荐2】如图,
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顺时针旋转
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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