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nhinhonhung
2 năm trước
Cho ΔABC ⊥A,đường phân giác BE.Kẻ EH ⊥Bc (H ∈BC).Gọi K là giao điểm của AB và HE.Chứng minh rằng: a) ΔABE= ΔHBE b)BE là đường trung trực của đoạn thẳng AH c)EK=EC d)AE<EC
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