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hq102002
2 năm trước
Cho hình bình hành ABCD. Gọi Ik theo thứ tự là trung điểm CD, AB, Dường chéo BD cắt AI, CK theo thứ tự ở M và N. Chứng minh a, AI //CK b, DM = MN = NB Yêu cầu có hình vẽ đoàng hoàng
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