cho x,y,z là các số thực dương thỏa mãn x+y+xyz=z

tìm max của P=$\frac{2x}{\sqrt{(x^2+1)^3}}+\frac{x^2(1+\sqrt{yz})^2}{(y+z)(x^2+1)}$

Câu hỏi này được treo giải thưởng trị giá +5000 vỏ sò bởi danielpadillawacky@gmail.com, đã hết hạn vào lúc 02-01-16 10:53 AM

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