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If x and y are positive, which of teh following must be

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If x and y are positive, which of teh following must be [#permalink] New post 25 Nov 2007, 19:51
If x and y are positive, which of teh following must be greater than 1/ (x+y)^1/2

I. (x+y)^1/2 / 2x
II. x^1/2 + y^1/2 / x+y
III. x^1/2 - y^1/2 / x+y
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 [#permalink] New post 25 Nov 2007, 22:09
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Does "x^1/2 + y^1/2 / x+y" mean "(x^1/2 + y^1/2) /( x+y)" or "x^1/2 + (y^1/2 / x+y)" or "x^1/2 + (y^1/2 / x)+y"?
  [#permalink] 25 Nov 2007, 22:09
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If x and y are positive, which of teh following must be

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