Bài toán học sinh lớp 3 Việt Nam khiến phương Tây phải đau đầu
Sau "bài toán sinh nhật" hóc búa cách đây không lâu của học sinh Singapore, tờ The Guardian lại tiếp tục đánh đố bạn đọc bằng một bài toàn khác, lần này là đề toán lớp 3 của Việt Nam.
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