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vnv_bmt
2 năm trước
B1 cho tam giác ABC trên cạnh B lấy điểm M, qua M kẻ MN//AC , MP// AP. (N thuộc AB, P thuộc AC) A. Tứ giác ANMP là hình bình hành B. Gọi I là trung điểm của NP, chứng minh A I M thẳng hàng.
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