Giải bài tính nhẩm khó nhất thế giới:
Alexis Lamaire, sinh viên Pháp 24 tuổi ngành tin học tại Reims, đã giải thành công bài tính nhẩm khó nhất thế giới, đó là tìm căn bậc 13 của một số có 200 chữ số.
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