Cho $x,y,z \geq 0 và x^{3}+y^{3}+z^{3}=3$. Tìm GTNN của 
P=$\frac{x^{3}}{3y+1}+\frac{y^{3}}{3z+1}+\frac{z^{3}}{3x+1}$
ak. dịp này sorry mn nha. mk kiếm lượt vote nên sẽ vote down. nhg yên tâm là mk sẽ huy vote down và vote up lại ngay lập tức các câu hỏi đó –  Effort 03-05-16 03:31 PM
s v jin> lỗi j z?. mak s chú bt –  Effort 03-05-16 03:30 PM
dừng dùng icon đăng câu hỏi vì bị lỗi :v –  ๖ۣۜJinღ๖ۣۜKaido 02-05-16 11:33 PM

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