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Bài 3 : Trên tia Ox , lấy hai điểm A,B sao cho OA = 7cm , OB = 3cm a) Tính AB ? b ) Trên tia đối của tia Ox , lấy điểm C sao cho OC = 6cm Lấy điểm D là trung điểm của đoạn thẳng OC ? Tính DO , DC ? c) Điểm O là trung điểm của đoạn thẳng nào ? Vì sao ? Giúp mình nha , mình đang cần gấp please lechiloveyou
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