Vẽ đường thẳng xy. Lấy điểm O nằm trên đường thẳng xy. Lấy điểm Mthuộc tia Oy. Lấy điểm N thuộc tia Ox. a) Viết tên hai tia đối nhau chung gốc O.b) Trong ba điểm M, O, N thì điểm nào nằm giữa hai điểm còn lại ?

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