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minhanhbebe
2 năm trước
ài 2:Trên tia Ox lấy 2 điểm A,B sao cho OA=3cm,OB=12cm a)Tính độ dài đoạn AB b)Trên tia đối của tia BA lấy điểm C sao cho BC=3OA.Điểm B có phải là trung điểm đoạn AC ko?VÌ SAO?
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