在
中,角
的对边分别为
已知向量
,
,且
.从①
的面积
,②角
的平分线
.这两个条件中选一个,补充到下面问题中,并完成解答:
(1)求角
的大小;
(2)若
,且________,求
的值.
![](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/914940a6a9f94277aa301cfe3d925e65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a285e3a53d2a28a6b5fb504899bf7860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67745442fdc1af6009cc78e8ea3191de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de19624d730580a50adf754debf9eb38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a73002a647453b874d45f228f3ab37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d43caf45baa25613be9c352a460a11c2.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae7888d643678ea18f83f3237732052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e24361e4842cdaa3da819c60b55107d7.png)
21-22高一下·浙江·期中 查看更多[2]
更新时间:2022-09-29 14:26:04
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(2)若
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【推荐2】在
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【推荐1】
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1470d7d8bdafbbc2a1aca4794f61215.png)
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【推荐2】设
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【推荐1】如图,某工厂欲将一块边长为40m的等边三角形ABC区域用一条公共通道DE分成面积相等的两个办公区域,点D,E分别在AB,AC上,设
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解题方法
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