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Eljoy
2 năm trước
Cho tam giác ABC điểm D thuộc cạnh BC gọi M là trung điểm của AD. Trên tia đối của tia MB lấy điểm E sao cho ME=MB. Trên tia đối của tia MC lấy F sao cho MF=MC.CM a.AE=BD b.AF s.song BC c.3 điểm A,E,F thẳng hàng
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