在
中,a,b,c分别为内角A,B,C所对的边,且
.
(1)求角C;
(2)设
,
,若延长
到D,使
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36931e119c45e006ba5b93d0bcad45a5.png)
(1)求角C;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b32e60558725703bfdb978cc6963b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
更新时间:2021-03-29 23:21:12
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【推荐1】已知
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87418bb3f37283fbec48387b07444cb.png)
(2)求
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【推荐2】已知
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(1)求
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(2)求
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【推荐1】如图,某校机器人社团需要制作一种四边零件
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/37960b1a-8d0f-47aa-97cc-50a8d6a01a2d.png?resizew=139)
(1)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/37960b1a-8d0f-47aa-97cc-50a8d6a01a2d.png?resizew=139)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97fe729f6099f25634f6e547085d966a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2c4d12b3a705daab723ab243b6cc88.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efa39fd2fbd0ffa55a35daeabe70e4eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f7705384a6eecb13e039f3134e9204e.png)
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【推荐2】在
中,角A,B,C的对边分别为a,b,c.
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61e551f3af8330e755046ed671d77e60.png)
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【推荐1】北京2022年冬奥会中,运动员休息区本着环保、舒适、温馨这一出发点,进行精心设计,如图,在四边形
休闲区域,四周是步道,中间是花卉种植区域,为减少拥堵,中间穿插了氢能源环保电动步道
,且
.
![](https://img.xkw.com/dksih/QBM/2022/6/1/2992127515582464/2994891215601664/STEM/606cb7be-40d6-4855-90a7-aa6295c72696.png?resizew=152)
(1)求氢能源环保电动步道
的长;
(2)若___________;求花卉种植区域总面积.
从①
,②
这两个条件中任选一个,补充在上面问题中并作答.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a4fd373a5def1d116381b23fd46056.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a74e0c0bacdb0110051dee23a3ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022365ed188bd800e0b8a2b4ec1e2303.png)
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【推荐2】在
中,角
的对边分别是
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.
(1)求证:
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(2)若
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的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d289c32e7689c2544c7f63ac18cb576.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802ab2964393cf983674b83f2c10cf19.png)
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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