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ngocthuong2928
2 năm trước
Cho tam giác ABC cân tại A. Điểm D thuộc cạnh AB, điểm E thuộc cạnh AC I sao cho AD = AE. Gọi K là giao điểm của Be và CD. Chứng minh rằng: a, BE=CD b, Tam giác KBD bằng tam giác KCE c,AK là tia phân giác của A
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