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3.trên đường thẳng d từ trái sang phải ta lấy các điểm A,D,C,B và lấy điểm O nằm ngoài đường thẳng d.Biết ^AOD = 30 độ ,^AOB = 120 độ. a, Tính số đo góc BOD b, Biết ^DOC = 2^BOC . Tính DOC và AOC
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