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hi1234
2 năm trước
Cho tứ diện ABCD.Gọi G là trọng tâm tam giác BCD và F nằm trên đoạn AB thỏa AF=2BF.Gọi M là 1 điểm trên cạnh BC sao cho MG ko song song với CD a)Tìm giao điểm của (ABG) và (FCD) b)Xác định giao điểm H của AG và FCD
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