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nguyenhuuquangdbp
2 năm trước
Cho tam giác ABC vuông tại A.KẺ HD vuông góc với AC(D thuộc AC).CE vuông góc với AB(E thuộc AB).Trên tia đối của tia BA lấy điểm M,trên tia đối của tia CA lấy điểm N sao cho BM=BN.Chứng minh tam giác ECN=tam giác DHM
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