bài 15: Cho M, N là hai điểm trên tia Ox. Biết OM = 5cm, MN = 2cm. Tính độ dài ON. có 2 cách nên làm đủ 2 cách nhé bài 16: Trên tia Ox lấy hai điểm A và B sao cho OA = 3cm, OB = 5cm a) Điểm A có nằm giữa O và B không? Vì sao? b) Tính độ dài đoạn thắng AB. b) Kẻ Oy là tia đối của Tia Ox. Trên tia Oy lấy điểm C sao cho OC = 3cm. Điểm O có là trung điểm của CA không? CA CA TỶ TỶ NHỚ GIÚP NHA

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