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lkdiem.camau
2 năm trước
Trên một đường thẳng lấy hai điểm A, B sao cho AB =5,6 cm rồi lấy điểm C sao cho AC=11,2cm và B nằm giữa A, C. Vì sao điểm B là trung điểm của đoạn thẳng AC
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