在
中,
,则角
是![](https://img.xkw.com/dksih/QBM/2023/3/12/3192827522105344/3193696826441728/STEM/bd16af8ad5344f26b09da898c4f419c3.png?resizew=4)
___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877e26784f5f8aab21317d8c61d2c1d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2023/3/12/3192827522105344/3193696826441728/STEM/bd16af8ad5344f26b09da898c4f419c3.png?resizew=4)
22-23高一·全国·课前预习 查看更多[1]
(已下线)6.4.1 正余弦定理(学案)-2022-2023学年高一数学一隅三反系列(人教A版2019必修第二册)
更新时间:2023-03-13 14:55:44
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【推荐1】如图,三个全等的三角形
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【推荐2】已知
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【推荐2】秦九韶是我国南宋著名数学家,在他的著作数书九章》中有已知三边求三角形面积的方法:“以小斜幂并大斜幂减中斜幂余半之,自乘于上以小斜幂乘大斜幂减上,余四约之为实一为从隅,开平方得积”如果把以上这段文字写成公式就是
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