cho các số dương $a,b,c$ thỏa mãn: $ab^{2}+bc^{2}+ca^{2}=3$. c/m: $\frac{2a^{5}+3b^{5}}{ab}+\frac{2b^{5}+3c^{5}}{bc}+\frac{2c^{5}+3a^{5}}{ca}\geq 15.(a^{3}+b^{3}+c^{3}-2)$
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????? thay đổi hoài –  Effort 02-06-16 12:11 PM
khờ ca s ko lm ad nữa mak xuống mod òi? –  Effort 31-05-16 10:43 AM

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