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\[\mathbb{R_+}: \frac{3}{10} \leqslant \sum \frac{a^3}{2a^3+(b+c)^3} < \frac{2}{3}\]
15MaxValue[{Total[#1^4/(29#1^4+(#2+#3)^4)&@@RotateLeft[{a,b,c},#]&/@{1,2,3}],a>0,b>0,c>0},{a,b,c}]
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2025-7-20 13:36 GMT+8
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