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uyenuyen
2 năm trước
Cho tam giác ABCCho M là một điểm thuộc miền trong của tam giác ABC . D, E, F là trung điểm AB, AC, BC;A’, B’, C’ là điểm đối xứng của M qua F, E, D. Chứng minh rằng a, AB’A’B là hình bình hành. b, CC’ đi qua trung điểm của AA’
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