已知
,
的夹角为
,且
,
,求:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/117242088f98b0bb5f5d233ee6a16532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c8861a2e503287d121c7b3e4c35c6a.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cf085c6a35b1038935c41457e9f38bc.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/756bb420d565bf418beabdae0008fb87.png)
更新时间:2018-04-25 19:28:58
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解题方法
【推荐1】已知
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【推荐2】已知
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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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【推荐1】已知两个不共线的向量
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(1)若
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解答题-问答题
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适中
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解题方法
【推荐2】已知向量
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![](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/d366d8fbb7258ee051f49977441e14a2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4952c9f1eef0c9e07806cf8605a388e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f5d2e176efcf02e085b011c35eeb4e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f7843df4cdc9b535b4c844b7f30b09.png)
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