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Cat face (6+2√5 •6-2√5) : 2 :D

Răspuns :

(6+2√5 •6-2√5) : 2 = (6+12√5 -2√5):2= 2(3+4√5-√5):2= 3+4√5-√5= 3+3√5= 3(1+√5).