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1 . 如图,中国海军为了加强南海的军事力量,对南海某处海底进行科考研究,在海平面内一条直线上的
三点进行测量,已知
,
,于
处测得水深
,于
处测得水深
,于
处测得水深
,(单位:百米),求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa069231aabec84b0e420a6636b2a78e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345bc44773ccdb95226fd2ed39d555bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690315174256640/2691033691668480/STEM/33f5a32a-2900-4146-81da-d384677f0b5c.png?resizew=310)
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2021-04-02更新
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84次组卷
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2卷引用:河北省张家口市宣化第一中学2020-2021学年高一下学期6月月考数学试题