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(6+√5)*(6-√5)=       Raspundeti repede va rog!!

Răspuns :

(6+√5)*(6-√5)=6·6-6√5+6√5-5=36-5=31
(6+√5)*(6-√5)=6*6-5=36-5=31 folosesti formula patratelor perfecte :)