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linh040105
2 năm trước
Cho tứ giác ABCD. Gọi E, F lần lượt là trung điểm của AB, CD. Gọi M, N, P, Q lần lượt là trung điểm của AF, EC, DE, BF. CMR: Các tứ giác EQFM, ENFP, MNPQ là hình bình hành.
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