Triển
12-03-2013, 05:48 AM
http://www.youtube.com/watch?feature=player_embedded&v=6yhiGj-252k
http://i.imgur.com/pbhLAhM.png
(nguồn: http://www.oecd.org/pisa/keyfindings/pisa-2012-results-overview.pdf )
http://i.imgur.com/pbhLAhM.png
(nguồn: http://www.oecd.org/pisa/keyfindings/pisa-2012-results-overview.pdf )