1 . 已知平面内点集
,A中任意两个不同点之间的距离都不相等. 设集合
,
. 给出以下四个结论:
①若
,则
;
②若
为奇数,则
;
③若
为偶数,则
;
④若
,则
.
其中所有正确结论的序号是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041bc291bff24b4cee0b205da68db1f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ebdde37c672e10fd4ffe741247e566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18faaff0b5622f33a1574103fed13edd.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdda00159c36552b8a9a9743324f82a0.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffaac03e1e452f075e86853fef2a33de.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdda00159c36552b8a9a9743324f82a0.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25df56dc9b8169cbf924f39bfa9f7c30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb931a4b3eaa34e2c6f7dab5650f8af.png)
其中所有正确结论的序号是
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2 . 向量是既有__________ 又有__________ 的量.共线向量__________ (是/不是)平行向量.
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