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family27042011
2 năm trước
cho tam giác ABC, D là một điểm trên cạnh AB. biết AD = 8cm,DB = 4cm.tính khoảng cách từ các điểm B và D đến cạnh AC,cho biết tổng các khoảng cạnh đó bằng 15cm giúp giải hộ mình nha cảm ơn
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