已知,边长为6的正方形ABCD中,AC、BD相交于点O,点E是直线AB上一点,点F是直线AD上一点,且
,连接EF交BD于点G,交AC于点H,则线段EH的长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d343ca820ade6b33980888dc2e9e49ad.png)
更新时间:2020-06-27 20:32:21
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【推荐1】如图,在正方形
中,点
为
的中点,连接
,点
在
上,连接
交
于点
,
,若
,则
的长为______ .
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【推荐2】如图,在
中,
,D为
中点.点E为
外一点,
,且
,连接
,则
长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】如图,△ABC是边长为1的等边三角形,取BC边中点E,作ED∥AB,EF∥AC,得到四边形EDAF,它的面积记作
;取BE边中点
,作
∥FB,
∥EF,得到四边形
,它的面积记作
.照此规律作下去,则
=_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
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【推荐2】如图,在矩形
中,
,
,E是
的中点,F是线段
上的一点,连接
,把
沿
折叠,使点B落在点G处,连接
,
的延长线交线段
于点H.给出下列判断:①
;②
;③当
时,
的长度是
④线段
长度的最小值是
;⑤当点G落在矩形
的对角线上,
的长度是3或
;其中正确的是________ .(写出所有正确判断的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
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【推荐1】图1是可折叠琴谱架上半部分的实物图,图2是图1的平面示意图(琴谱架钢条的宽度忽略不计),四边形
为矩形,
,B、
分别为
、
的中点,
、
分别为
、
的中点.
,
为滑动轨道,滑道
比
小
,折叠琴谱架时,
上点
、
上点
分别在滑道
、
上滑动时,各钢条可以绕连接点
、B、
、
、
、
、
、
、
转动.当点
、
分别滑到
、
时,此时
、B、
、
、
、
、
、
、
、
、
、P、
、
、
在一条直线上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/19/4e7d3a3c-5434-49df-9be8-c1e0533f97f8.png?resizew=542)
(1)琴谱架中
的长为______
.
(2)当琴谱架折叠成图3,图4是图3的平面示意图,当
、
、
三点共线时,求滑动的距离
为______
(结果保留根号).
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/19/4e7d3a3c-5434-49df-9be8-c1e0533f97f8.png?resizew=542)
(1)琴谱架中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)当琴谱架折叠成图3,图4是图3的平面示意图,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3219b9e18a82e80c32e4e0a264feb4ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
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【推荐2】如图,已知点A是双曲线y=
在第一象限分支上的一个动点,连接AO并延长交另一分支于点B,以AB为边作等边三角形ABC,点C在第四象限内,且随着点A的运动,点C的横、纵坐标之间存在一规律,这个规律是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e2123b68402a85dd51f5f3873d7a91.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/18/f3415efb-fe30-4315-afc6-d22a0a14feef.png?resizew=170)
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【推荐1】如图,平行四边形OABC的顶点C在x轴的正半轴上,O为坐标原点,以OA为斜边构造等腰Rt△AOD,反比例函数y=
(m>0)的图象经过点A,交BC于点E,连接DE,若tan∠AOC=3,DE∥x轴,DE=2,则m的值为___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f7626c207a4dc82d4d59cb520c91e49.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/ade8d70f-526d-4e85-b458-79f99e24ac01.jpg?resizew=147)
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【推荐2】如图,三角形纸片
中,点D在边
上,连接
,使得
,将这张纸片沿直线
翻折,点C落在
处,连接
,且
,若
,
,则点A到直线
的距离是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffde61add21650a248a2c805c0a4809d.png)
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![](https://img.xkw.com/dksih/QBM/2021/12/19/2875887037743104/2877161206292480/STEM/8914a4ed-e7e2-43db-ac0f-109934205bcd.png?resizew=212)
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