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2 năm trước
Trên tia Ox lấy hai điểm A,B sao cho Oa=2,AB=4 M là trung đểm của AB Trên tia Ox lấy điểm H sao cho OH=2 cm a, Tính HA,HB.HM b,O có phải là trung điểm của HA hay k
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