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2 năm trước
Cho tam giác ABC vuông cân ở A, M thuộc BC, BM > MC. Đường thẳng vuông góc với BC tại M cắt AB, AC lần lượt ở D, E. I, K lần lượt là trung điểm của EC, BD. F, N, O lần lượt là trung điểm của AB, AC, KI. Chứng minh F, N, O thẳng hàng.
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