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oliuoliuza
2 năm trước
Trên tia Ox lấy 2 điểm A và B sao cho OA=2 cm; OB=6cm. a,Trong 3 điểm O,A và B điểm nào nằm giữa 2 điểm còn lại. b,Tính độ dài đoạn thẳng AB. c,Vẽ trung điểm M của đoạn thẳng AB.Chứng tỏ A là tung điểm của đoạn thẳng OM.
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