cho hai tia Oa và Ob không đối nhau. trên tia OA lấy điểm A#O, trên tia OB lấy điểmB#O.gọi C là 1 điểm bất kỳ nằm giữa A và B .Vẽ điểm M sao cho O nằm giữa C và M. Hãy chứng tỏ tia OCnằm giữa hai tia OAvà OB. Trong ba tia OA,OB,OM có tia nào nằm giữa hai tia còn lại ko?

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