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tuyettrinh2322002
2 năm trước
Cho hình vuông ABCD. Trên cạnh BC, CD lấy hai điểm `E,F` sao cho `hat{FAE}=hat{BAE}+hat{DAF}`. Trên tia đối tia `BC` lấy `BQ=DF`. `P` là giao điểm của `AB,QF`. Cmr `BE ≥2 sqrt{AB.BP}`
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