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Loga1235
2 năm trước
Ai giúp em bài này với ạ: Trên cùng 1 nửa mặt phằng bờ chứa tia Ox vẽ 2 tia Oy, Oz sao cho xOy = 30 độ, xOz = 120 độ. a) Tính yOz. b) Vẽ tia Oa sao cho xOa = 75 độ. Tia Oa có phải là tia phân giác của yOz không, vì sao. c) Tia Ob là tia đối của tia Oy, tia Oc là tia đối của tia Oz. Tính bOc.
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