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vanbmt0405
2 năm trước
Câu 8: Cho hình bình hành ABCD, các đường chéo cắt nhau tại O. Gọi E, F lần lượt là trung điểm của OD, OB. Gọi K là giao điểm của AE và CD. Chứng minh rằng: a) AE song song với CF b) DK = KC/2
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