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pinkandblackrabbit522001
2 năm trước
Cho tam giác ABC nhọn, trên BC lấy K, D sao cho BK<BD. Từ K dựng đường thẳng qua E song song với AD cắt AB tại F, dựng đường thẳng qua E song song với BC cắt AC tại F. Gọi M,M là trung điểm AC, BD Chứng minh rằng a)CM EF/BC+EK/AD=1 b)Gọi P là giao điểm của AM với EF. CM: P là trung điểm của EF c)CM MN chia đôi KF *Làm câu c thôi nhé
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