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thang24012002
2 năm trước
Cho tam giác ABC trên cạnh BC lấy điểm D sao cho DB/DC=1/2 Đường thẳng qua D song song với AB cắt AC ở E đường thẳng qua D song song với AC cắt AB tại F a) so sánh tỉ số AF/AB và AE/AC b) Gọi M là trung điểm của AC chứng minh EF//BM c) Giả sử DB/DC =k tìm k để EF//BC
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