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Math Help - simplify complex fraction

  1. September 13th 2010, 06:49 AM #1
    ailmasum
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    simplify complex fraction

    (x-9)/(x/9-9/x)
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  2. September 13th 2010, 07:03 AM #2
    yeKciM
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    Quote Originally Posted by ailmasum View Post
    (x-9)/(x/9-9/x)
    \displaystyle \frac {x-9 } { \frac {x}{9} -\frac {9}{x}} = \frac {x-9 } { \frac {x^2 -81}{9x} } = \frac {\frac {x-9}{1}}{\frac {x^2 -81}{9x}} = \frac {9x(x-9)}{x^2-81} = \frac {9x^2-81x}{x^2-81} =
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