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doviettien
2 năm trước
Cho hình vuông ABCD cạnh bằng căn(1 + căn 3). Vẽ tam giác đều ABC điểm E ở trong hình vuông .gọi F là giao điểm của đường chéo BD và đoạn AE .tính diện tích tam giác ABF
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