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tranthiquynh472004
2 năm trước
Cho 2 tia Oa và Ob không đối nhau .Trên tia Oa lấy điểm A không trùng với điểm O,trên tia Ob lấy điểm B không trùng với điểm O . Gọi C là 1 điểm bất kì nằm giữa A và B . Vẽ điểm M sao cho O nằm giữa C và M Chứng tỏ tia OC nằm giữa 2 tia OA và OB Trong 3 tia tia nào nằm giữa 2 tia còn lại?
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