如图,长方形ABCD沿BE折叠使点C落在点F,BF交AD于M,EF交AD于N,AB=4cm,BC=10cm,NF=ND,则CE长为____ cm.
![](https://img.xkw.com/dksih/QBM/2021/11/12/2849477826625536/2851105318895616/STEM/65a19fe9-8161-438c-95e6-bb0216a29389.png)
更新时间:2021-11-14 14:11:31
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【推荐1】魏晋时期,伟大数学家刘徽利用如图通过“以盈补虚,出入相补”的方法,即“勾自乘为朱方,股自乘为青方,令出入相补,各从其类”证明了勾股定理.已知四边形
、四边形
、四边形
均为正方形.
(1)若
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_______ ;
(2)若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aecec3c3b0f9ab7f48cf74f5b04a1e9e.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(1)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d7c91d2cb3cad1b77e0175d89f84a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aecec3c3b0f9ab7f48cf74f5b04a1e9e.png)
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名校
【推荐2】如图,在
中,
,
平分
,
于
点,连接
,若
的面积为
,则
的面积为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172ade2cf53584382c95806433b322f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】已知一个圆锥体的三视图如图所示,则这个圆锥体的侧面积为_______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/c86ef6ed-08e0-4a2c-8c36-217b1684a0b7.png?resizew=233)
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【推荐2】如图,已知矩形ABCD,E,F分别是边AB,CD的中点,M,N分别是边AD,AB上两点,将△AMN沿MN对折,使点A落在点E上.若AB=a,BC=b,且N是FB的中点,则
的值为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6ce02259a85ea191541f4a708738f1.png)
![](https://img.xkw.com/dksih/QBM/2019/10/26/2320273146068992/2326870364438528/STEM/9634d6c5b54b47c2a9acb8ec80e6eea6.png?resizew=151)
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解题方法
【推荐1】在矩形ABCD中,
,
,点E 是AD上一动点,过点E作EF∥BD交AB于F,将△AEF沿EF折叠,点A的对应点
落在△BCD的边上时,AE的长为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/82c0f278-0652-4692-9394-7667860327b3.png?resizew=158)
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【推荐2】如图,矩形
的对角线
相交于点O,E为线段
上一点,连接
,将三角形
沿
折叠,点B恰好和点O重合.若
,则
长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d0b0b7d07ac1aebab6b6f1e8c6acdc.png)
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