Khai mạc kỳ thi Olympic Toán tuổi thơ toàn quốc 2013
Sáng 8/6, tại thành phố Vĩnh Yên, Vĩnh Phúc, kỳ thi Olympic Toán tuổi thơ toàn quốc lần thứ 9 năm 2013 đã chính thức khai mạc.
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