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dundung
2 năm trước
cho hai góc kề bù AOB và BOC, trong đó góc AOB gấp 3 lần góc BOC a) tính góc BOC b) trên nửa mặt phảng bờ AC có chứa tia OB, vẽ tia OD sao cho: góc AOD= góc BOC. hỏi tia OB có là tia phân giác của góc COD không vì sao? vẽ hình nữa nha giúp mình vs mình đang cần gấp
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