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khoapham8384
2 năm trước
cho tam giác ABC ,có AB=16.5,AC = 21 trên canh AB, AC lấy các điểm P, Q Sao cho AP=11,AQ=14 Chứng minh PQ//BC Gọi G là trong tâm của tam giác ABC Chưng minh P, Q, G thẳng hàng
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