Just to my curiousity, isn't that too difficult for these kids to learn the maths inside the photo? That's all calculus... (even though one of my friend learnt those in grade 9...)作者: mcjohnjohn 時間: 2011-8-17 00:27
Just to my curiousity, isn't that too difficult for these kids to learn the maths inside the photo? ...
lo_pak 發表於 2011-8-17 06:31