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khiemdonguyen2510
2 năm trước
Cho hình thang ABCD(AB//CD). Gọi M,N là trung điểm của AC và BD. H,K là hình chiếu vuông góc của M,N trên BC và AD. Chứng minh giao điểm I của KN và HM cách đều C và D
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