对于同一平面内的三条直线a,b,c,给出下列五个结论:①a∥b;②b∥c;③a⊥b;④a∥c;⑤a⊥c.请以其中两个作为已知条件,一个作为结论,组成一个正确的语句_________________________ (用数学语言作答).
更新时间:2018-04-05 22:20:07
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【知识点】 平行公理及推论
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