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共线是不是平行
更新时间: 2020-10-31 00:00:00  

两个向量共线属于平行。在同一个平面内,两条直线共线就是一条直线,属于平行;但是平行不属于共线,如两条直线不在同一个平面,虽然有平行关系,但不是共线。方向相同或相反的非零向量叫平行向量。表示为a‖b,任意一组平行向量都可移到同一直线上,因此平行向量也叫共线向量。

关键词: 平行

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