在
中,若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd5b9bbd3d22bd2cef53dd4b9691257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e1bd4f72b3edd9647378d1191857fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
20-21高二上·广西南宁·期中 查看更多[4]
广西南宁市第十中学2020-2021学年高二上学期段考数学试题(已下线)专题9.3《解三角形》(A卷基础篇)-2020-2021学年高一数学必修第四册同步单元AB卷(新教材人教B版)广东省珠海市实验中学金湾学校2020-2021学年高一下学期3月月考数学试题广西平果市第二中学2020-2021学年高一下学期期中考试数学试题
更新时间:2020-11-21 08:35:00
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【推荐1】阅读材料:余弦定理是描述三角形中三边长度与一个角余弦值关系的数学定理,运用它可以解决一类已知三角形两边及夹角求第三边或者已知三边求角的问题.余弦定理是这样描述的:在
中,
、
、
所对的边分别为
、
、
,则三角形中任意一边的平方等于另外两边的平方和减去这两边及这两边的夹角的余弦值的乘积的
倍.
用公式可描述为:
,
,
,
现已知在
中,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
用公式可描述为:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee46ca0c5ad5a133433f4279b8d6e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed30e986562fd87d35139bac3e986d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c758c96ec80590409dbf142d91fa33.png)
现已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a6f36741b86f464be362b12bac13d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
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【推荐2】若
的三边长为2,4,5,则
的最大角的余弦值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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