INEQUALITY'S BLOG

May 18, 2012

Problem 315 vankhea

Filed under: Problem by Van Khea — KKKVVV @ 11:28 am

if a, b, c are positive real numbers satisfying ab+bc+ca=3 then prove that
(2+3a^3)(2+3b^3)(2+3c^3)\geq 125

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May 17, 2012

Problem 313 vankhea

Filed under: Problem by Van Khea — KKKVVV @ 11:03 pm

If a, b, c, d are positive real numbers then
(3+a^3)(3+b^3)(3+c^3)(3+d^3)\geq 4(a+b+c+d)^3