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cuong017a
2 năm trước
Trên tia Ox vẽ ba điểm A , B , C sao cho OA=4cm , OB=6cm , OC=8cm. a) Tính độ dài các đoạn thẳng AB , BC. b) Điểm B có là trung điểm của đoạn thẳng AC không ? Vì sao?
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