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khoa133ggui
2 năm trước
1.Cho điểm O nằm trên đường thẳng AB. Vẽ trên cùng một nửa mặt phẳng bờ AB các tia OC, OD sao cho góc AOC =BOD =30 độ. Gọi OE là tia đối của tia OD. Tia OA là phân giác của góc nào ? Vì sao?
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