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efectuati:(√11-√7)(√11+√7*(√5-√3)(√5+√3)=
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Răspuns :

(  \sqrt{11} -  \sqrt{7} )(\sqrt{11} +\sqrt{7} )(\sqrt{5} -\sqrt{3})(\sqrt{5}+\sqrt{3} )=
(11-7)(5-3)=
4 x 2=
8