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1 . 已知空间向量
.
(1)计算
和
;
(2)求
与
夹角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3d8e2a1761d761e257ebf8d63df38a.png)
(1)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f0484158c0bb8ef08faf224bba82e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0378850babaf830f1ac2f580c84d43.png)
(2)求
![](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/c24095e409b025db711f14be783a406c.png)
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2024-02-24更新
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278次组卷
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2卷引用:广东省湛江市雷州市第二中学2023-2024学年高二下学期开学考试数学试题