Cho $a,b,c\geq 0$ , $a+b+c=3$.CMR:
$\frac{25}{3\sqrt[3]{4(ab+bc+ac)}}\geq \frac{a+1}{b+1} +\frac{b+1}{c+1}+\frac{c+1}{a+1}$
Cho $a,b,c\geq 0$ , $a+b+c=3$.CMR:
$\frac{25}{3\sqrt[3]{4(ab+bc+ac)}}\geq \frac{a+1}{b+1} +\frac{b+1}{c+1}+\frac{c+1}{a+1}$
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Áp dụng BĐT AM-GM: $VT=\frac{25}{3\sqrt[3]{2.2(ab+bc+ac)}} \geq \frac{25}{ab+bc+ca+4}=\frac{25}{ab+bc+ca+a+b+c+1} \geq \frac{25}{(a+1)(b+1)(c+1)}$Cho $a,b,c\geq 0$ , $a+b+c=3$.CMR:
$\frac{25}{3\sqrt[3]{4(ab+bc+ac)}}\geq \frac{a+1}{b+1} +\frac{b+1}{c+1}+\frac{c+1}{a+1}$
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