Problem no.$6$
$(\sqrt 5+\sqrt 6 +\sqrt 7)(\sqrt 5+\sqrt 6-\sqrt 7)(-\sqrt 5-\sqrt 6+\sqrt 7)(-\sqrt 5+\sqrt 6+\sqrt 7) =?$
BdMO National Junior 2006/6
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Re: BdMO National Junior 2006/6
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