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vanmen711
2 năm trước
Cho điểm M thuộc miền trong của tứ giác lồi ABCD. Gọi A’, B’, C’, D’ lần lượt là điểm đối xứng của M qua trung điểm các cạnh AB, BC, CD, DA. Chứng minh tứ giác A’B’C’D’ là hình bình hành.
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