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quanganh0401
2 năm trước
Bài 1: Cho M,N là hai điểm trên tia Ox. Biết OM=5cm , MN=2cm. Tính độ dài ON Bài 2: Trên tia Ox lấy hai điểm A và B Sao cho OA=3cm, OB=5cm a) Điểm A có nằm giữa O và B ko? Vì sao? b) Tính độ dài đoạn thẳng AB. c) 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 ko? Caccau giúp tớ với.
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