22-23高二上·浙江·期中
解题方法
1 . 已知
,内角
所对的边分别是
,
的角平分线交
于点D.若
,则
的取值范围是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbff3d1fd2fdcb0e7678ae67fd2ed33e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87cbe582412d273d214f338fe3c0f1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解题方法
2 . 在
中, 内角
的对边分别为
, 且
.
(1)求 A;
(2)请从问题①②中任选一个作答(若①②都做,则按①的作答计分)
①若
, 求
周长的取值范围;
②求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b378a2df371f5ff1815c03a84f571229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40fe401db356f2d6e9b7adc9a19d8fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d261fe22d9780dcb1d5b3ef76a32f3.png)
(1)求 A;
(2)请从问题①②中任选一个作答(若①②都做,则按①的作答计分)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9af6b8933cb0bcc983a15c903b5892e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c05d18602dfe75c80fdd48f1a9c361.png)
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解题方法
3 . 在锐角
中,a,b,c分别是角A,B,C的对边,若
.
(1)求B;
(2)若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/940ee26a93eaf4e1f67dea515a1f5fd1.png)
(1)求B;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1810555c0c28fe352841322b85bbc6.png)
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