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holehap


vơi a+b+c =1 CMR:
(19b^3 - a^3)/(ba + 5b^2} + (19c^3 - b^3)/(cb + 5c^2} + (19a^3 - c^3)/(ac + 5a^2)\leq 3
(19b^3 - a^3)/(ba + 5b^2} + (19c^3 - b^3)/(cb + 5c^2} + (19a^3 - c^3)/(ac + 5a^2)\leq 3
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