已知向量
与
的夹角为
,且
.
(1)求
;
(2)当
为何值时
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8387486521f812aabecb7f4bf7ee84.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc23a04cdac6439ea170e799f1c1df5.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82506fee756890236e54059b31dc1d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698333f960fad71c4d7e6fa7f4805e89.png)
更新时间:2023-05-10 22:42:52
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【推荐1】已知向量
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(1)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
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(1)求
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【推荐2】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd4a0e172633699d47d303020491715.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596705c3090f2ebd3867249fda1a167c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e6999f779e269586647f8fe5861b222.png)
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