1 . 设△ABC的内角A,B,C的对边分别为a,b,c,
,且B为钝角.
(1)证明:
;
(2)再从下列三个条件中选出两个条件,求△ABC的面积.①
,②
,③
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e008862231c1f2e9b6197ea3c5b629aa.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd2d90ed8b5f265bb5b0a8c84b4b743.png)
(2)再从下列三个条件中选出两个条件,求△ABC的面积.①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42190fdb24c6e918e06eb4a2ebf8856f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b326dc38d92806c8911b9f9e1a3f323e.png)
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2022-11-07更新
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2卷引用:贵州省黔南州2023届高三上学期10月质量监测数学(理)试题