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Demonstrate the inequality: [(a+b)/c]*[(b+c)/d]*[(c+d)/a]*[(d+a)/b]>16
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We know that (sqrt a + sqrt b)^2=a+b+2sqrt (a*b)
a+b>2sqrt (a*b) and (a+b)/c>2sqrt (a*b)/c
c+b>2sqrt (c*b) and (c+b)/d>2sqrt (c*b)/d
c+d>2sqrt (c*d) and (c+d)/a>2sqrt (c*d)/a
a+d>2sqrt (a*d) and (a+d)/b>2sqrt (a*d)/b
Posted by giorgiana1976 on June 2, 2009 at 4:31 AM (Answer #1)
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