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D为线段AC上一点,
,
,且满足
,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d0dab12b09e2245a30877ae7b0ba585.png)
(1)求角B的大小;
(2)设D为线段AC上一点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
更新时间:2022-03-04 20:21:02
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【推荐1】已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87eb1d698a82e21de4a113df74232dd0.png)
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(1)求
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(2)若
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【推荐3】已知函数
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(1)求
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(2)当
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【推荐1】在锐角
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(1)求角
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】设函数
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(1)求
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(2)已知角
![](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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b0efbeca95f057612a7b5891d21aeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0c16303d33332f107e9c264f67b430a.png)
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【推荐1】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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(2)若
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适中
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解题方法
【推荐2】在
中,角
,
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-问答题
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适中
(0.65)
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解题方法
【推荐1】在△ABC中,角
所对的边分别为
,已知
.
(1)求
的大小;
(2)
的面积等于
,D为BC边的中点,当中线AD长最短时,求AB边长.
![](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/0907aac0589c935d7a0392909dc3b5d8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
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【推荐2】在①
;②
;③
这三个条件中任选一个,补充在下面问题中,并解答.
问题:已知
的内角
,B,C所对的边分别为a,b,c,________.
(1)求A;
(2)若
,
的面积是
,求
的周长.
(注:如果选择多个条件分别解答,按第一个解答计分)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/155ecc4a22a0933429ed61e214a7aa27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02522c49d028b4ab111cd3b73fb9a563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8391a30a191b22e483db135fd476cd.png)
问题:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)求A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](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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适中
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【推荐3】已知函数
.
(1)求函数
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(2)在
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(1)求函数
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(2)在
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