Cho a,b,c>0 và $21ab+2bc+8ca\leq 12$
CM: $\frac{1}{a}+\frac{2}{b}+\frac{3}{c}\geq \frac{15}{2}$
Cho a,b,c>0 và $21ab+2bc+8ca\leq 12$
CM: $\frac{1}{a}+\frac{2}{b}+\frac{3}{c}\geq \frac{15}{2}$
Cho a,b,c>0 và $21ab+2bc+8ca\leq 12$
CM: $\frac{1}{a}+\frac{2}{b}+\frac{3}{c}\geq \frac{15}{2}$
$\sqrt{O}$ve math
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