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duongthanhchuc305
2 năm trước
Cho tam giác ABC vuông tại A , đường phân giác CD (C ∈ AB). Trên cạnh BC lấy điểm E sao cho CE = CA. AE cắt CD tại H. Chứng minh a) ΔACH = ΔECH b) CD là đường trung trực của AE
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