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If abc=1

prove

1/[a

where a, b, c are positive real numbers.

Please give me a hint.

prove

1/[a

^{3}(b+c)] + 1/[b^{3}(a+c)] + 1/[c^{3}(b+a)] >= 3/2where a, b, c are positive real numbers.

Please give me a hint.

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