1/Cho xOy= 20°.VẽyOzkể bù với xOy. VẽzOt = 95° sao cho tia Ot nằm giữa hai tia Oy và Oz. Tính số đo yOt 2/Cho xOy= 80° và Oz là tia phân giác của góc đó. Trên tia Ox lấyđiểm M, dựng tia Mt nằm trong góc đó sao cho OMt =100°, a) Chứng mình Mt //Oy. b) Gọi Mt' là tia đối của tia Mt, Mn là tia phân giác của OMt '. Chứng minh Mn // Oz.

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