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honganh2006
2 năm trước
trên tia ox lấy 2 điểm A và B sao cho OA=4cm,OB=8cm. a,tính độ dài đoạn thẳng AB. b, Chứng tỏ A là trung điểm của đoạn thẳng OB. c,Gọi P là trung điểm của đoạn thẳng OA,Q là trung điểm của đoạn thẳng AB. Chứng tỏ OB=2 nhân PQ.
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