1 . 在某海域有一个雷达观测站A,某时刻测得一艘匀速直线行驶的船只位于A北偏东
且与A相距
海里的位置B处,经过30分钟又测得该船已行驶到点A北偏东
(其中
,
)且与点A相距
海里
的位置C处
(1)求该船的行驶速度(单位:海里/小时);
(2)若距A点18海里水域为警戒区,且该船不改变航行方向继续行驶.判断它是否会进入警戒水域,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b342d5cb6dd1c84a82f6aca68ed829c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4bd0a21072ffcf1b1b6df460cf3bf26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b58590a9629dcfad2ff68522cd80dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a00b858b15906a88bbe6c4fe105685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d6a2dda4951d5607b0003a5586f33cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e4123975f257306440158659634c4a.png)
![](https://img.xkw.com/dksih/QBM/2017/4/21/1670345781460992/1670791538524160/STEM/90bb5aff63854129b99f51db46992514.png?resizew=4)
(1)求该船的行驶速度(单位:海里/小时);
(2)若距A点18海里水域为警戒区,且该船不改变航行方向继续行驶.判断它是否会进入警戒水域,并说明理由.
![](https://img.xkw.com/dksih/QBM/2017/4/21/1670345781460992/1670791538524160/STEM/6965bf8741d44931a343b1352ce66e13.png?resizew=134)
您最近一年使用:0次
2 . 在△ABC中,A=60°,b=1,其面积为
,则
等于
![](https://img.xkw.com/dksih/QBM/2017/4/21/1670345781460992/1670791538188288/STEM/380936c6f88e45918a1efacfdc8aa802.png?resizew=24)
![](https://img.xkw.com/dksih/QBM/2017/4/21/1670345781460992/1670791538188288/STEM/599f3626d79948b58bec4cf2568682b1.png?resizew=85)
A.3![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
3 . 在
中,
面积为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c13fadefec9d4bad9149b6d5cd3e0e.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c58e203bc5f4869659dfc74ef2e7ec0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c13fadefec9d4bad9149b6d5cd3e0e.png)
您最近一年使用:0次
4 . 已知
的内角
,
,
的对边分别为
,
,
,已知
,
,
,则
的面积为
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436465152/STEM/e32a2dd1a26c46919076e577d97fa57b.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436465152/STEM/aa8f52b6cbf846509188733a5302209e.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436465152/STEM/79d24fa2ca694dbfa862b4a80aa579d4.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436465152/STEM/0612b5cf4a314ae980317441202fd6bb.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436465152/STEM/4ac9b5c6c99b4ad88e277bb4d7442a39.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436465152/STEM/8cf936d18f9f41b1a9292475013d7cfc.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436465152/STEM/3e13f3279b6c4b79a28f565a9949d060.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436465152/STEM/cd429b9e303d426b86500063829e1350.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436465152/STEM/8aaf9762fc3f469f88d8b4b4ea3e9ece.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436465152/STEM/c1736c3ef2a144fe87ca21965e202d0e.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572933430534144/1572933436465152/STEM/e32a2dd1a26c46919076e577d97fa57b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
5 . 在
中,角
的对边分别为
,且
,
,求
的大小.
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437947904/STEM/d40c2251320c475e815117db33ba2169.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437947904/STEM/46cf11f8a5dd40c0842d4e82b8c16e75.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437947904/STEM/f997f007f328447d8bec71c5c7ef280f.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437947904/STEM/db25ca0824de492dbbd48b28fc2bf2fd.png)
您最近一年使用:0次
6 . 在
中,角
所对的边分别为
.已知
,
,则
=_____________ .
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437857792/STEM/c736b261a150454b94107bdae70c4d6f.png?resizew=45)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437857792/STEM/3e7810f3ef244fc294f9c4bdb9a2f4ab.png?resizew=69)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437857792/STEM/562c1ff6cb9c4b9c96c156e307ffd917.png?resizew=60)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437857792/STEM/1e0be4d7405343ebb9f77eb5bdd7dc41.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437857792/STEM/2e9fddb0dd904eb6aa4ec2e632de9b52.png?resizew=52)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437857792/STEM/a21a3b88072949b9920e2d21120733d1.png?resizew=39)
您最近一年使用:0次
7 . 某学习小组进行课外研究性学习,为了测量如图所示不能到达的
两地,他们测得
两地的直线距离为2
,并用仪器测得相关角度大小分别为
,![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/374a6829568943afaa998a74bcec3cea.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/8d37b64d3cc4450284fe45ea236bb3e5.png)
则
两地的距离大约等于(提供数据:
,结果保留两个有效数字)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/0e58a1dfb7f34a4e92237f775d8e0b5e.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/c8add5f6b25c433b97f055e2d619c1e1.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/c99d2bb5b3bb483192acf5c0d8e3ee05.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/67784d4aec614b80b618eb175d98f2be.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/30223f8139ac48a396330823df9162ef.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/374a6829568943afaa998a74bcec3cea.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/8d37b64d3cc4450284fe45ea236bb3e5.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/56bf8868d2834859bdbc0ad62ce54f71.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/c8add5f6b25c433b97f055e2d619c1e1.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/673af60922ae41cc995e9c7ddf1c9c1c.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572869432475648/1572869437751296/STEM/0e58a1dfb7f34a4e92237f775d8e0b5e.png)
A.1.3 | B.1.4 | C.1.5 | D.1.6 |
您最近一年使用:0次
8 . 在
中,内角
的对边分别为
,且满足
.
(1)求角
的大小;
(2)若
且
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e548279cf480fbe3e81e3483327541.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56eee45baf8ec905a2f0fb79d482ed68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3247e6cd7b47c3a6be5970a2955e1a.png)
您最近一年使用:0次
2016-12-04更新
|
1702次组卷
|
13卷引用:湖北省襄阳市第四中学2017届高三高考适应性考试数学(文)试题
湖北省襄阳市第四中学2017届高三高考适应性考试数学(文)试题湖北省襄阳四中2017届高三下学期5月适应性考试数学(文)试题2016届河南省郑州市高三第二次模拟考试文科数学试卷2017届湖南师大附中高三文上学期月考四数学试卷湖北省武汉二中、麻城一中2016-2017学年高一下学期期中考试数学(文)试题【市级联考】四川省广元市2019届高三第二次高考适应性统考数学理试题广东省中山市第一中学2019-2020学年高二上学期10月月考数学试题湖南省长沙市明德中学2019-2020学年高三上学期9月月考数学(文)试题2018届湖北省荆州中学、宜昌一中等“荆、荆、襄、宜四地七校考试联盟”高三上学期10月联考数学(文)试题2019届四川省广元市高三第二次高考适应性统考数学文试题山东省青岛超银高级中学2019-2020学年高三上学期10月数学试题河北省张家口市第一中学2019-2020学年高二下学期3月月考(衔接班)数学试题(已下线) 专题20三角形中的不等和最值问题(讲)-2021年高三数学二轮复习讲练测(文理通用)
9 . 马航
牵动全球人的心,世界各国积极投身到马航的搜救工作中,了解海底构造是救援工作要做的第一件事.某搜救队在某海域的海平面上的同一条直线上的
,
,
三点进行测量,得
,
,于
,
,
三处测得水深分别为
,
,
,如图所示,试利用你所学知识求
的余弦值.
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/67f98e6ba99a40908feafc097ada07b0.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/db28e5948bbd47a7827de5123695bef9.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/5cd38facc8ad44be87069c5e726e8c1f.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/82937fafc008424f954708b35f6a020d.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/2af8314307b04373a2fdcd81149421e8.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/2b2c011aed11420b96642de717bcb4a2.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/db28e5948bbd47a7827de5123695bef9.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/5cd38facc8ad44be87069c5e726e8c1f.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/82937fafc008424f954708b35f6a020d.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/0947752acb2543c28e560215d039391e.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/bc266de5a1684053a093fae1756a1e7b.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/72dc88f7001a4060b7b405400f8e1084.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/3ab8c06b5d9e4ac0a30fad6aa0b6e199.png)
![](https://img.xkw.com/dksih/QBM/2015/7/2/1572161744633856/1572161750204416/STEM/35e6c29019e84753a96872517a63bd5b.png)
您最近一年使用:0次
10 . 在
中,三边
满足
,则角
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61639add17c040979777e8af6c037bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次