如图,在矩形ABCD中,E,F分别为边CD,AD的中点,CF与EA、EB分别交于点M,N.已知AB=8,BC=12,则MN的长为___________ .
![](https://img.xkw.com/dksih/QBM/2021/12/11/2869988806205440/2871530778771456/STEM/10ec56bf-5d80-44ac-ab81-b3da0de625e4.png?resizew=247)
更新时间:2021-12-13 10:47:14
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【推荐1】如图,在△ABC中,AB=6,AC=8,BC=10,P为边BC上一动点(且点P不与点B、C重合),PE⊥AB于E,PF⊥AC于F,M为EF中点.设AM的长为x,则x的取值范围是______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/1aa7185b-1304-4318-a044-96f27d4771be.png?resizew=197)
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【推荐2】如图,矩形
的面积为
,对角线交于点
;以
,
为邻边做平行四边形
,对角线交于点
;以
,
为邻边做平行四边形
;
;依此类推,则平行四边形
的面积____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】如图,正方形
的边长是4,点E,F分别是
,
边上的点,且满足
,
,连接
,
交于点G,
交
于点H,则四边形
的面积为______ .
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【推荐2】如图,在矩形ABCD中,E是AD边的中点,
,垂足为点F,连接DF,分析下列四个结论:
∽
;
;
;
其中正确的结论有______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfaebe7fc2db10d221ff4ad6d670b83d.png)
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【推荐3】如图,∠MON=30°,点A1在射线OM上,过点A1作A1B1⊥OM交射线ON于点B1,将△A1OB1沿A1B1折叠得到△A1A2B1,点A2落在射线OM上;过点A2作A2B2⊥OM交射线ON于点B2,将△A2OB2沿A2B2折叠得到△A2A3B2,点A2落在射线OM上;…按此作法进行下去,在∠MON内部作射线OH,分别与A1B1,A2B2,A3B3,…,AnBn交于点P1,P2,P3,…Pn,又分别与A2B1,A3B2,A4B3,…,An+1Bn,交于点Q1,Q2,Q3,…,Qn.若点P1为线段A1B1的中点,OA1=
,则四边形AnPnQnAn+1的面积为___________________ (用含有n的式子表示).
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