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huypham220727
2 năm trước
Bài 1 :cho n điểm trong đó không có 3 điểm nào thẳng hàng cứ đi qua 2 điểm ta vẽ được một đường thẳng Hỏi có tất cả bao nhiêu đường thẳng? Bài 2 :Cho 50 điểm trong đó có đúng 10 điểm thẳng hàng ngoài ra không có 3 điểm nào thẳng hàng cứ qua 2 điểm ta vẽ được một đường thẳng Hỏi có tất cả bao nhiêu đường thẳng? bài 3:n điểm trong đó không có 3 điểm nào thẳng hàng cứ qua 2 điểm ta vẽ được một đường thẳng có tất cả 55 đường thẳng hỏi n bằng bao nhiêu?
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