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tranphuongchi05
2 năm trước
Cho ΔABC (AB<AC), đường cao AK. Gọi 3 điểm D,E,F lần lượt là trung điểm của AB,AC,BC a, Tứ giác BDEF là hình gì ? Vì sao ? b, Chứng minh tứ giác DEFK là hình thang cân c, Gọi O là trung điểm DE, chứng minh A,O,F thẳng hàng
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