如图,在矩形
中,
,点
从点
出发,沿射线
以
的速度匀速移动.连接
,过点
作
,
与射线
相交于点
,作矩形
,连接
.设点
移动的时间为
,若
与矩形
的边平行,则
的值是______ s.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4230925a0f10454bfe7940db0a1251a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f0805cc7a96c866df10b667ac4851e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d744165d6aad705f64de41a9d931750a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/19/0fe47a02-b3f5-4b86-b279-ee08746b76b8.png?resizew=170)
更新时间:2024-03-19 16:54:11
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【推荐1】已知
和
是矩形
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沿直线
翻折后,点D落在点E处,三角形
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【推荐2】如图,在矩形ABCD中,AB=6,AD=2,E、F分别是AB和DC上的两个动点,M为BC的中点,则DE+EF+FM的最小值是_____ ;若∠EFD=45°,则DE+EF+FM的最小值为____
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真题
【推荐1】如图,在△ABC中,AB=AC=15,点D是BC边上的一动点(不与B、C重合),∠ADE=∠B=∠α,DE交AB于点E,且tan∠α=
.有以下的结论:
![](https://img.xkw.com/dksih/QBM/2015/8/20/1573898389078016/1573898395262976/STEM/5d5c34f091f549a0b81890ea51cb419c.png?resizew=227)
①△ADE∽△ACD;
②当CD=9时,△ACD与△DBE全等;
③△BDE为直角三角形时,BD为12或
;
④0<BE≤
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①△ADE∽△ACD;
②当CD=9时,△ACD与△DBE全等;
③△BDE为直角三角形时,BD为12或
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679ec4b3991a6a773a89b3d1b0160eae.png)
④0<BE≤
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其中正确的结论是
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【推荐2】如图,四边形
是边长为1的正方形,
是等边三角形,连接
并延长交
的延长线于点
,连接
交
于点
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;
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;④
.其中正确的有______ .(填序号)
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【推荐1】如图,
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交
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