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moctra581395
2 năm trước
Cho hình chữ nhật ABCD, E là một điểm trên cạnh AB, DE cắt AC tại F và cắt CB tại G. A. Chứng minh tam giác AFE đồng dạng với tam giác CFD B. Chứng minh FD^2=FE.FG
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