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cutrongxoay1521
2 năm trước
Cho tam giác acb 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.a, CMR: AB’A’B là hình bình hành.b, CMR: CC’ đi qua trung điểm của AA’ hộ mk đi các bạn
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