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thanhtruong64vl
2 năm trước
Cho hình thang ABCD có hai đường chéo cắt nhau tại I a chứng minh rằng IA.ID=IB.IC b lấy E trên cạnh AB,F trên cạnh CD sao cho 3AE=AB;3CF=CD chứng minh E,I,F thẳng hàng
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