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hoanguyenthptyd3
2 năm trước
Cho hình bình hành ABCD . TRên đường chéo BD lấy 2 điểm M , N sao cho BM = DN = 1/3 BD a) AC cắt BD tại O AM cắt BC tại I . CM : AM = 2MI b) CN cắt AD tại K . CM : T và K đối xứng với nhau qua O
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