1 . 若
,则
与
为共线向量. ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f9f8764c76c9b62a0a60af753a1e82c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
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2 . 已知
为第一象限角,若
,则
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c61cfbfd3bf888856b7dc9b2a84c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f031eecd0793ccf4677ee2d47cf1bc.png)
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3 . 若向量
,则
或
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c05f1d68b133c5d2f76a06186e0ffb08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ce380bce6978d2acd0742bed4e98e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ecfaf651f46c6915a3f463d67ec0e5c.png)
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4 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f987c777f3aaf496edfe74674af627.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f987c777f3aaf496edfe74674af627.png)
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解题方法
5 . 如果
,则四点O,P,M,N一定共面.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3fcb4196d6b5832c787cfa3853fb02.png)
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