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【两空间向量的平行关系的数学表达式】
两空间向量的平行关系的数学表达式
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2020-02-04 20:26
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李振富
假设是向量a和向量b若平行则向量a=k向量bk是一个常数若为正则两向量同向若为负则两向量反向
2020-02-04 20:28:50
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