如图1是生活中常见的人字梯,也称折梯,因其使用时,左右的梯杆及地面构成一个等腰三角形,看起来像一个“人”字,因而把它形象的称为“人字梯”.如图2是其工作示意图,
,拉杆
,则
之间的距离为______ m.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8547abd79aa738339e6427cad310d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/f5a0e32e-74ff-427e-8de2-b370785fb69c.png?resizew=170)
更新时间:2024-03-21 22:28:25
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【知识点】 相似三角形的判定与性质综合
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【推荐1】菱形ABCD边长为4,点E在直线AD上,DE=3,连接BE与对角线AC交点M,那么
的值是 _________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f6039eb12b502683fa787718600206.png)
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【推荐2】如图,在
中,
,
,点
、
分别在
边和
边上,沿着直线
翻折
,点
落在
边上,记为点
,如果
,而且DF//AB,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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