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Anhduc00
2 năm trước
Cho tam giác ABC cân ở A. Gọi D,E,F theo thứ tự là trung điểm của AB, BC, AC. Cho M là điểm đối xứng của E qua D. Chứng minh a, Tứ giác BCFD là hình thang cân b, Tứ giác ADEF là hình thoi c, Tứ giác ABCM là hình chữ nhật d, BA điểm N,A,M thẳng hàng e, ba điểm N, A, M thẳng hàng
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