№1043
0
\[\begin{array}{l} {\left( {\frac{a}{b}} \right)^3} + {\left( {\frac{b}{c}} \right)^3} + {\left( {\frac{c}{a}} \right)^3} \geqslant 3 \hfill \\ (a > 0,{\text{ }}b > 0,{\text{ }}c > 0) \hfill \\ \end{array}\]
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