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dixu732k
2 năm trước
Cho 159 điểm phân biệt trong đó có 2 bộ 3 điểm thẳng hàng. Cứ qua 2 điểm kẻ 1 đường thẳng. Hỏi có tất cả vao nhiêu đường thẳng?
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