△ABC的内角A,B,C的对边分别为a,b,c,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc329f17fac9666a35ddac1ac5bd2d69.png)
(1)求
;
(2)若
,求△ABC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc329f17fac9666a35ddac1ac5bd2d69.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1311f32edf13f8caee5edb03f24a7ba.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28fe84c03333fb3bd029391dd1697ce2.png)
19-20高三·云南·阶段练习 查看更多[2]
云南省名校2019-2020学年高考适应性月考统一考试数学(理)试题(已下线)专题1.3+正弦定理、余弦定理的应用(2)(基础练)-2020-2021学年高二数学十分钟同步课堂专练(苏教版必修5)
更新时间:2019-10-14 13:36:38
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【知识点】 正余弦定理与三角函数性质的结合应用
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】在①
,②
这两个条件中任选一个,补充在下面问题中的横线上,并给予解答:问题:锐角
的内角A,B,C的对边分别为a,b,c,且
,___________,求
周长的取值范围.
注:如果选择条件①和条件②分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0d87efc3feeefcda39283c79068e9fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
注:如果选择条件①和条件②分别解答,按第一个解答计分.
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】在
中,它的内角
,
,
的对边分别为
,
,
,且满足
.再从条件①,条件②,这两个条件中选择一个作为已知,求:
(1)
的值
(2)
的面积;
条件①:
,
;
条件②:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/ca5402d0b88b8110590f85de7f01444e.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f743572cb1bf498d65a553803b3273a8.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82986ab38a4ae58593191ccae2a44f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de97240876647a833045cf4f8b1417e.png)
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