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Trên tia Ox, vẽ 2 đoạn thẳng OM và ON sao cho OM=3cm, ON=5cm a) Trong 3 điểm M,N,O điểm nào nằm giữa 2 điểm còn lại ? b) Tính độ dài đoạn thẳng MN. c)Trên tia đối của tia MN lấy điểm P sao cho NP=2cm. Điểm N có phải là trung điểm của đoạn MP ko ? Vì sao ? em chỉ cần câu c thôi ạ, cảm ơn mn
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