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find the value of the expression

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find the value of the expression [#permalink] New post 21 Jun 2008, 14:04
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find the value of the expression

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Re: mgmat PS [#permalink] New post 21 Jun 2008, 19:12
gmatnub wrote:
find the value of the expression


3sqrt80=12sqrt5

3(9-4sqrt5)/[(9+4sqrt5)(9-4sqrt5)]=27-12sqrt5/(81-80)=27-12sqrt

sqrt(12sqrt5+27-12sqrt5)=sqrt27

do they have sqrt27 as answer? Or you can simplify it to 3sqrt3
Re: mgmat PS   [#permalink] 21 Jun 2008, 19:12
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