在等腰
中,∠BAC=120°,AD为边BC上的高,点E满足
,若AB=m,则
的长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/472cec16cb7e7e3f2f60c7364814e8ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
2020高三·全国·专题练习 查看更多[2]
更新时间:2020-09-30 23:21:04
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【推荐1】边长为2的正三角形
内(包括三边)有点
,
,求
的取值范围_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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【推荐2】如图,冠豸山上原有一条笔直的山路
,现在又新架设了一条索道
,小李在山脚
处看索道
,测得张角
;从
处攀登4千米到达
处,回头看索道
,测得张角
;从
处再攀登8千米方到达
处,则索道
的长为______________ 千米.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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