Bài 1 : Vẽ hình không nêu cách vẽ Vẽ óc xOy = 60 độ ; vẽ tia Oa là tia phân giác của góc xOy và tia Ob là tia đối của tia Oa, cho biết : a. Số đo của óc xOb? Không tính chỉ dùng thước b. Góc nào là góc bẹt?

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