Trên cùng một nửa mặt phẳng bờ chứa tia Ox, vẽ 2 tia Oy và Oz sao cho góc xOy = 120 độ, góc xOz = 30 độ. a, Trong ba tia Ox, Oy, và Oz , tia nào nằm giữa 2 tia còn lại. Vì sao ? b. Góc yOz là góc gì? Vì sao ? c. Vẽ tia Ot nằm giữa hai tia Ox và Oy sao cho góc xOt = 60 độ. Chứng minh : Ot là tia phân giác của góc xOy . Cảm ơn mọi người nhiều.

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