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khiphach265
2 năm trước
2: Cho tam giác ABC cân tại A. I là trung điểm của AB, K là trung điểm của AC. a) Chứng minh BK = CI. b) BK cắt CI tại O. Chứng minh △OIB = △OKC. c) Chứng minh AO là phân giác của góc BAC.
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