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dnlchi86
2 năm trước
Cho tứ diện ABCD.Gọi I,K lần lượt là trung điểm của AB,CD và J là 1 điểm trên đoạn AD sao cho AD=3JD a)Tìm giao điểm F của IJ và (BCD) b)Tìm giao tuyến d của 2 mặt phẳng (IJK) và (ABC)
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