$a,b,c>0$;$ab+bc+ca=3$. Tìm giá trị lớn nhất của
$A= \frac{a}{a^4+8a+7}+\frac{b}{b^4+8b+7}+\frac{c}{c^4+8c+7}$
$ab+bc+ca=3$;$A= \frac{a}{a^4+8a+7}+\frac{b}{b^4+8b+7}+\frac{c}{c^4+8c+7}$
Started By bimcaucau, 28-04-2021 - 21:32
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