Bài 6: Cho hai góc kề nhau AOB và BOC có tổng bằng 120 độ và BOC = AOB/5 a) Tính góc AOB ? b)Trên cùng một nửa mp chứa tia OE và OD với bờ là đường thẳng chứa tia OA. Vẽ tia OE sao cho tia OB là phân giác của góc EOD. Tính góc AOE ?

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