INEQUALITY'S BLOG

July 11, 2011

Problem 221 (van khea)

Filed under: Problem by Van Khea — KKKVVV @ 10:57 pm

Let a, b, c\geq 0. Prove that: 27(a^3b^2+b^3c^2+c^3a^2)^2\leq (a^2+b^2+c^2)^5

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