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anhcreal2610
2 năm trước
cho tam giác ABC vuông tại A , AB = 3 , BC = 5 . a , trên tia đối của tia BA lấy D sao A là trung điểm của BD chứng minh tam giác BCD cân .gọi E là giao điểm , BE dao AC tại I . CM DI đi qua trung điểm của BC
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