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dorislouisa4
2 năm trước
Cho tam giác ABC cân tại A trên cạnh AB lấy điểm D, trên canh AC lấy điểm E Sao cho AD =AE Gọi M là giao điểm của BE và CD Chứng minh rằng a) BE=CD B) góc BMD=góc CME c)AM là tia phân giác của góc BAC
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