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tucoi28998
2 năm trước
cho tam giác ABC, gọi M,N lần lượt là các điểm chia cạnh AB, BC theo tỉ số -1, -2/5, đường thẳng MN cắt AC tại P, a giả sử P chia MN theo tỉ số k, P chia AC theo tỉ số k', tính vectow BP theo BA, BC và K, vecto BP theo BA, BC và k' từ đó suy ra k/k' b. tính các tỉ số MN/MP, AP/AC
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