1 .
的内角
的对边分别为
.若
成等比数列,且
,则![](https://img.xkw.com/dksih/QBM/2014/1/8/1571466068803584/1571466074398720/STEM/a498c10997a949d2a7d6b60d7affac8b.png)
![](https://img.xkw.com/dksih/QBM/2014/1/8/1571466068803584/1571466074398720/STEM/2b25ad40ddcc44718d73e2ff5e5a83e7.png)
![](https://img.xkw.com/dksih/QBM/2014/1/8/1571466068803584/1571466074398720/STEM/cc57f267fe2a477488c784e629881209.png)
![](https://img.xkw.com/dksih/QBM/2014/1/8/1571466068803584/1571466074398720/STEM/48fe966d6fa14be9bad6b64779462a1a.png)
![](https://img.xkw.com/dksih/QBM/2014/1/8/1571466068803584/1571466074398720/STEM/48fe966d6fa14be9bad6b64779462a1a.png)
![](https://img.xkw.com/dksih/QBM/2014/1/8/1571466068803584/1571466074398720/STEM/49806f4d976c4f4f927b50deed4fdae7.png)
![](https://img.xkw.com/dksih/QBM/2014/1/8/1571466068803584/1571466074398720/STEM/a498c10997a949d2a7d6b60d7affac8b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 在
则![](https://img.xkw.com/dksih/QBM/2015/11/6/1572280580694016/1572280586452992/STEM/859fc7e6f5964f1c927b082034e31ce3.png)
![](https://img.xkw.com/dksih/QBM/2015/11/6/1572280580694016/1572280586452992/STEM/5c45144d33f34da598b5930dc5de3c77.png)
![](https://img.xkw.com/dksih/QBM/2015/11/6/1572280580694016/1572280586452992/STEM/859fc7e6f5964f1c927b082034e31ce3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 设
的内角
所对的边分别为
若
,则
的形状为
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435168997376/STEM/9ba74a9c137043dd9a4314c40fe5415c.png)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435168997376/STEM/c8d0c48873524769ade553aca40f2b15.png)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435168997376/STEM/40ca5708e6264a43b5783d08ba67d0f2.png)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435168997376/STEM/0efccd33d8644940aafc0d4bc5b574f4.png)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435168997376/STEM/9ba74a9c137043dd9a4314c40fe5415c.png)
A.锐角三角形 | B.直角三角形 | C.钝角三角形 | D.不确定 |
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4 . 在
中,角
所对的边分别为
,若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.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/6129fbf40a950fc8c516f0abaab21957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5a612d52503d10c175042d999046d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a69d14a712e08a64baff4ec4f2fe63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
A.2 | B.![]() | C.![]() | D.1 |
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2016-12-04更新
|
303次组卷
|
3卷引用:2015-2016学年甘省天水一中高一下期末理科数学试卷
13-14高三上·海南省直辖县级单位·期中
5 . 在△
中,角A、B、C所对的边分别为a、b、c,且满足
,则
的最大值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ce7733ad8fec530b6ce33614d08e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0400beb4097ff8d2cef328e1d55354.png)
A.![]() | B.![]() | C.![]() | D.2![]() |
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2016-12-02更新
|
672次组卷
|
5卷引用:2014届甘肃省兰州一中高考模拟一理科数学试卷
(已下线)2014届甘肃省兰州一中高考模拟一理科数学试卷(已下线)2013届海南琼海嘉积中学高三上质量监测(三)理科数学试题(已下线)2014届河北省唐山一中高三上学期期中考试理科数学试卷2015-2016学年江西丰城中学高一下学期月考二数学(文)试卷2015-2016学年江西丰城中学高一下月考二数学(文)试卷
6 . 两座灯塔A和B与海洋观察站C的距离都等于
, 灯塔A在观察站C的北偏东
,
灯塔B在观察站C的南偏东
,则灯塔A与灯塔B的距离为![](https://img.xkw.com/dksih/QBM/2010/5/7/1569720567676928/1569720572403712/STEM/3e94fe6d6edd4cb8912f318b3cf0696f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6d2b9e977907aa7bd2e38ed17d1b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2f409aeaaa949d56d696e01278ef38d.png)
灯塔B在观察站C的南偏东
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbbaeaa86f9c160b4e734c2248d30c03.png)
![](https://img.xkw.com/dksih/QBM/2010/5/7/1569720567676928/1569720572403712/STEM/3e94fe6d6edd4cb8912f318b3cf0696f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
7 . 记
的内角A,B,C的对边分别为a,b,c,设向量
,
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd5a5570f8c9bfd683202b211ae06bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/857a52b83a3e3eda0dbf6da951ecf8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4d070c5939bb0ec4a9d40d7e3c7d3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
8 . 在△ABC中,A=60°,
,
,则B=
![](https://img.xkw.com/dksih/QBM/2016/3/2/1572510959083520/1572510964736000/STEM/4dc5d27ebe044070967e5029f24f3676.png)
![](https://img.xkw.com/dksih/QBM/2016/3/2/1572510959083520/1572510964736000/STEM/63d2d18991074f8995279e55773eebca.png)
A.45° | B.135° | C.45°或135° | D.以上答案都不对 |
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9 . 在△ABC中,若
,则
与
的大小关系为
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435168882688/STEM/adb1a2634b394674adbdd605faea4f4d.png)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435168882688/STEM/e2315daa380945fea1af972bb95b52de.png)
![](https://img.xkw.com/dksih/QBM/2016/12/29/1619435168735232/1619435168882688/STEM/751047fed1804d7387bdb37d8e563c18.png)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
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