已知△ABC中,角A、B、C的对边分别为a、b、c,且
, 则
的值是____________ .
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572041679740928/1572041684746240/STEM/2f37e6304afe42b39285d616ed238621.png?resizew=145)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e5d4f93699f8dcffb0e7840ca5597e.png)
更新时间:2016-12-03 11:09:54
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【知识点】 余弦定理边角互化的应用解读
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【推荐1】在
中,内角
的对边长分别为
,已知
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
_________ .
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【推荐2】设
的三边分别为
,
,
,若
,
,则
的外接圆半径为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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