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lethiduyen10021981
2 năm trước
5 bạn A, B, C, D, E mỗi người vẽ 4 đường thẳng và đếm số giao điểm của các đường thẳng đó. Biết : A đếm được 2 giao điểm B đếm được 3 giao điểm C đếm được 5 giao điểm D đếm được 6 giao điểm E đếm được 7 giao điểm. Chứng minh rằng một người trong số họ đã sai.
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