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thanhhuyen195
2 năm trước
cho tam giác ABC có AB=12cm,AC=20cm,BC=28cm.Đường phân giác của góc A cắt BC tại D.qua D kẻ đường thẳng DE//AB(E€AC) a,tính DB,DC,DE b,cho biết diện tích tam giác ABC là S.Tính diện tích các tam giác ABD,ADE,DCE
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