在
中,内角A,B,C的对边分别为a,b,c,且
.
(1)求角B的大小;
(2)设
,
.
(ⅰ)求a的值;
(ⅱ)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d0cc4d61dfb880db04764da89679805.png)
(1)求角B的大小;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39372e70f5465f8cf0c5ebf7653f0e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80a23e198d6e7b6bccc8d284709c594.png)
(ⅰ)求a的值;
(ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f3a180c35808d1fe14ae17876c4cc0.png)
更新时间:2024-03-25 21:16:03
|
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【推荐1】从①
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记
的内角A,B,C的对边分别为a,b,c.若______,求角B的大小.
注:如果选择多个条件分别解答,按第一个解答计分.
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记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
注:如果选择多个条件分别解答,按第一个解答计分.
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【推荐2】
的内角A,B,C的对边分别为a,b,c,且
.
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(2)
的平分线与BC交于点D,若
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面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d211f511f18e2d72a32889a16b352ba3.png)
(1)求A的值;
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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【推荐1】在△ABC中,角A,B,C的对边分别为a,b,c,且sin2A+sin2B+sin2C=sinAsinB+sinBsinC+sinCsin A.
![](https://img.xkw.com/dksih/QBM/2020/1/12/2375509904162816/2375596464209920/STEM/8923efdf5c5f4b4c83afe8a200c9baef.png?resizew=284)
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![](https://img.xkw.com/dksih/QBM/2020/1/12/2375509904162816/2375596464209920/STEM/8923efdf5c5f4b4c83afe8a200c9baef.png?resizew=284)
(1)证明:△ABC是正三角形;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92a0e7176a768155ecd6ec4f4607ee62.png)
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【推荐2】
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(1)求
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【推荐1】已知函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b29a7faa14a6e09d0db2d04f4ced03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6675a3e76fc37b4cf69b3661b734daf.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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【推荐2】在如图所示的
中,有
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