如图,将正方形纸片ABCD沿EF折叠,折痕为EF,点A的对应点是点A′,点B的对应点是点B′,点B′落在边CD上,若CB′:CD=1:3,且BF=10,则EF的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/a3f45e88-b6a4-44df-a706-d1b40a888f18.png?resizew=111)
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更新时间:2020-07-22 11:15:27
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【推荐1】如图,C是线段AB上一动点,△ACD,△CBE都是等边三角形,M,N分别是CD,BE的中点,若AB=4,则线段MN的最小值为( )
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712451252314112/2715324597215232/STEM/fccfb24155104cc9a4935f8323ba2c39.png?resizew=141)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712451252314112/2715324597215232/STEM/fccfb24155104cc9a4935f8323ba2c39.png?resizew=141)
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【推荐2】课本中有这样一句话:“利用勾股定理,可以作出
,
,
,…的线段(如图).”记
,
,…,
的内切圆的半径分别为
,
,…,
,若
,则
的值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/25/b25c1736-4b8f-4f50-bb02-1af76ffbdc7a.png?resizew=197)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐1】如图,矩形
中,
,
,点
为矩形内一动点,且满足
,则线段
的最小值为( )
![](https://img.xkw.com/dksih/QBM/2020/1/26/2385581335240704/2386173304143872/STEM/28552cd4-9be1-44ce-8b2a-4c7e1b5b34af.png?resizew=181)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5673b9f8819c6f8c3bf15856cb65b9f8.png)
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![](https://img.xkw.com/dksih/QBM/2020/1/26/2385581335240704/2386173304143872/STEM/28552cd4-9be1-44ce-8b2a-4c7e1b5b34af.png?resizew=181)
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【推荐2】如图,在矩形ABCD中,AB=4,对角线AC,BD交于点O,sin∠COD=
,P为AD上一动点,PE⊥AC于点E,PF⊥BD于点F,分别以PE,PF为边向外作正方形PEGH和PFMN,面积分别为S1,S2.则下列结论:①BD=8;②点P在运动过程中,PE+PF的值始终保持不变,为
;③S1+S2的最小值为6;④当PH:PN=5:6时,则DM:AG=5:6.其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/2022/8/4/3037017155239936/3066197650112512/STEM/e46da2083d0f4e70a3643da85853124e.png?resizew=135)
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【推荐1】如图,将边长为3的正方形纸片ABCD对折,使AB与DC重合,折痕为EF,展平后,再将点B折到边CD上(不与端点重合),使边AB经过点E,折痕为GH,点B的对应点为M,点A的对应点为N,那么折痕GH的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/99dca1c8-3029-46d4-9206-acec035d2c9c.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/99dca1c8-3029-46d4-9206-acec035d2c9c.png?resizew=145)
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【推荐2】如图,在正方形纸片
中,对角线
,
交于点
,折叠正方形纸片
,使
落在
上,点
恰好与
上的点
重合,展开后,折叠
分别交
,
于
,
,连接
,下列结论:①
②
③
④四边形
是菱形,正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/3c8ef523-1e29-4afe-8665-27a0d193daa3.png?resizew=100)
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【推荐1】在平面直角坐标系中,
按如图方式放置(直角顶点为A),已知A(2,0),B(0,4),点C在双曲线
(x>0)上,且AC=
,将
沿x轴正方向向右平移,当点B落在该双曲线上时,点A的横坐标变成( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7281b641656a5992abaafb4190ca9afc.png)
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【推荐2】已知,如图所示的一张三角形纸片ABC,边AB的长为20cm,AB边上的高为25cm,在三角形纸片ABC中从下往上依次裁剪去宽为4cm的矩形纸条,若剪得的其中一张纸条是正方形,那么这张正方形纸条是( )
![](https://img.xkw.com/dksih/QBM/2017/9/27/1783219192987648/1785349999837184/STEM/c3857708c8cd49889682dc6f2ceae0d9.png?resizew=176)
![](https://img.xkw.com/dksih/QBM/2017/9/27/1783219192987648/1785349999837184/STEM/c3857708c8cd49889682dc6f2ceae0d9.png?resizew=176)
A.第4张 | B.第5张 | C.第6张 | D.第7张 |
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