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Bài 3.Trên nửa mặt phẳng có bờ chứa tia Ox, vẽ hai tia Oy và Oz sao cho góc xOy = 300, góc xOz = 700 a ) Chứng tỏ tia Oy nằm giữa hai tia Ox và Oz. Tính yOz ? b) Gọi Ox’ là tia đối của tia Ox, Om là tia phân giác của zOx' .Tính mOy ? c) Gọi tia Ot là tia phân giác của góc xOz .Tính mOt ?
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