如图,在平面四边形
中,
,设
.
,求
的长;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bf3fdfb47d0b9c7d1af4c48a653e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8cc5e8fc797a3a45c253b783631d4e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191b58ddee63f4a8642e47cc899223ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e60436c1f7b5c2f6b5331548216e8077.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe4c2c4492dd5bffd67dbf7cb6d25bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc24d605ad707ad0e76059d8a31f50d3.png)
更新时间:2024-05-24 11:29:06
|
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】在
中,角
,的对边分别为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16c30701144de929b875643ec466889f.png)
(1)求角
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(2)若
,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16c30701144de929b875643ec466889f.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3c0ede83f7860f62371bfb5070fc2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】
中,已知
,点
在边
上,
.
(1)证明:
;
(2)若
,求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c33d7005b5818c4cb34cea35ea2bee08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3b17b8fc84b128c9947531269a5401.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01476dfb5970e27f54f742c27b9515f9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc5c4b886a48affa3e6103f7e4c2bfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】在
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,求
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![](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/071a7e733d466949ac935b4b8ee8d183.png)
您最近一年使用:0次
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适中
(0.65)
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【推荐2】已知函数
.
(1)求函数
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(2)在锐角
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,
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,
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,已知
,
,
,求
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,
及分别对应的边长
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c23f82c8e91e1e4626d772e031e1c3f.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17fff6cad52af74309c2d811fa5e508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2719a15b85193b46fe37fab973dfd2f.png)
(2)在锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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