1 . 如图,在
中,角
的对边分别为
,且满足
,线段
的中点为
.
![](https://img.xkw.com/dksih/QBM/2020/4/14/2441311607185408/2442599023927296/STEM/a1b364694d894a5a8ba8b9ad7498e5df.png?resizew=266)
(Ⅰ)求角
的大小;
(Ⅱ)已知
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0ae8e92dd3119d41f2c830ea526516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ace74bfb716753490ebe0e740ff5baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3768d1f14dfd559a1105e7aa1f68c566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2020/4/14/2441311607185408/2442599023927296/STEM/a1b364694d894a5a8ba8b9ad7498e5df.png?resizew=266)
(Ⅰ)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(Ⅱ)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a12c3ca7c821137d233b6dc7c0cdd08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
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2020-04-16更新
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6卷引用:河南省天一大联考2021届高三下学期阶段性测试(六)数学(理科) 试题
2 . 在
中,角A,B,C所对的边分别为a,b,c,已知
,
,则B=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67cf40b73e4b9b9bd9fffb7e85b95808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b86d43790babcdbbdc03493ee70928.png)
A.45° | B.60° | C.60°或120° | D.45°或135° |
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2020-03-17更新
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3卷引用:2016年河南省普通高中学业水平考试数学试题
10-11高二下·湖南·阶段练习
名校
3 . 在
中,
.则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232191f341e6db2da54fca169f9a13bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f9fabbbe61a759e52ec975215e2e7c.png)
A.![]() ![]() | B.![]() | C.![]() | D.以上答案都不对 |
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2020-03-13更新
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6卷引用:2019年12月河南省实验中学高二学业水平测试一数学试题