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tranthuhuongg1911
2 năm trước
trong mặt phẳng tọa đọ OXY cho các điểm A(1;3) B(-4;2) C (3;1) 1. tính OA ;OB;OC 2.tính dài trung tuyến AM của tam giác ABC tính chu vi ; diện tích tam giác ABC
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