如图,菱形ABCD的对角线AC、BD相交于点O,E、F分别是AB、BC边的中点,连接EF,若EF=
,BD=4,则菱形ABCD的边长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef812f839622326a7d7027cc806aaeb.png)
![](https://img.xkw.com/dksih/QBM/2019/10/12/2310440342339584/2311103753912320/STEM/0b00cc90baac46ccbcb9eccf779df3eb.png?resizew=166)
更新时间:2019-10-16 18:01:55
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【推荐1】如图,在△ABC中,AB=3,AC=5,点D,E,F分别是AB,BC,AC的中点,则四边形ADEF的周长为_____ .
![](https://img.xkw.com/dksih/QBM/2019/3/1/2151244891521024/2152791906648065/STEM/9146972b93b54c748763c70d75060911.png?resizew=179)
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【推荐2】如图,点
,
分别是
的边
,
的中点,连接
,过点
作
,交
的延长线于点
.若EF=6,则
的长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐1】定义:在平面直角坐标系中,O为坐标原点,设点P的坐标为
,当x<0时,点P的变换点
的坐标为
;当
时,点P的变换点
的坐标为
.抛物线
与x轴交于点C,D(点C在点D的左侧),顶点为E,点P在该抛物线上.若点P的变换点
在抛物线的对称轴上,且四边形ECP′D是菱形,则满足该条件所有n值的和为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a79a33a83a7ba57a34b5093d1d1d02.png)
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【推荐2】在菱形ABCD中,对角线AC,BD相交于点O,M是CD的中点,连接AM并延长,交BD于点E,交BC的延长线于点F,取EF的中点N,连接CN.若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5f441402ee632377b6bedeb060f3d9.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3dfcd8aff269dd5aba398816490c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e1e4a9162e4a3740f60a131af76c21.png)
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