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sunny.452003
2 năm trước
Trong mặt phẳng Oxy, gọi A,B lần lượt là điểm biểu diễn của số phức 1 2 + i và − +2 i . Mệnh đề nào dưới đây đúng ? A. Tam giác OAB tù. B. Tam giác OAB đều. C. Tam giác OAB vuông và không cân. D. Tam giác OAB vuông cân.
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