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minhdzvl
2 năm trước
Trên tia Ox lấy hai điểm A và B sao cho OA = 7cm ; OB = 3cm. a) Tính AB. b) Cũng trên Ox lấy điểm C sao cho OC = 5cm. Trong ba điểm A, B, C điểm nào nằm giữa hai điểm còn lại? c) Tính BC ; CA. d) Điểm C là trung điểm của đoạn thẳng nào? Vì sao?
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