Vẽ hai tia Oy và Oz trên cùng một nửa mặt phẳng bờ chứa tia Ox, sao cho xOy= 40 độ,xOz= 80 độ. a) Tính số đo góc yOz, từ đó suy ra Oy là tia phân giác xOz. b) Vẽ tia Om là tia đối của tia Ox, tính mOy. c) Trên nửa mặt phẳng bờ Ox, không chứa tia Oz, vẽ Op sao cho xOp= 100 độ. Chứng minh rằng Op, Oz đối nhau.

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