如图所示,在平面四边形
中,
为正三角形.
![](https://img.xkw.com/dksih/QBM/2020/2/27/2408261073543168/2409577866321920/STEM/89d7633f315a471a908e1f404b85a8de.png?resizew=122)
(1)在
中,角
的对边分别为
,若
,求角
的大小;
(2)求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e913f512786a71b35b20f5dfc53af04c.png)
![](https://img.xkw.com/dksih/QBM/2020/2/27/2408261073543168/2409577866321920/STEM/89d7633f315a471a908e1f404b85a8de.png?resizew=122)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/06232c27cb30888ef836e4223a1b8c5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
更新时间:2020-02-29 18:41:37
|
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适中
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名校
【推荐1】已知函数
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(1)求函数
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(3)在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd2ed49b4be25eac88aa2af01aa84c15.png)
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名校
解题方法
【推荐2】在
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(1)求
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![](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)
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(1)求
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ca820a456491348e72587e4fe10bc6.png)
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【推荐1】已知向量
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e9b4d43dcc5238219029dd35d7e032.png)
(1)求
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(2)求
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解答题-证明题
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适中
(0.65)
名校
解题方法
【推荐2】如图,三角形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c227b4a487f5a065e6ef04d91325889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5722140012b5c3ddf3dd6cbe379ada2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dbc03936d140432c53872ac1c1aed12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/981aaa8023922b09a57baba09fc51220.png)
(3)直接写出
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解题方法
【推荐1】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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(2)若
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解答题-问答题
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(0.65)
解题方法
【推荐1】在
中,内角A,B,C所对的边分别是a,b,c.已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75cf6d83a811970a28dd341d8ce156c8.png)
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解答题-问答题
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适中
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【推荐2】海中有
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
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