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traitimbangtuyet hasn't added any friends yet.
08-10-2011 - 21:09
10-06-2011 - 19:00
cho a,b,c >0c/m : $(1+a^3)(1+b^3)(1+c^3)\ge (a+bc)(b+ca)(c+ab)$bài này bạn nào tinh ý là nhận ra ????
22-05-2011 - 11:22