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Cel mai inteligent răspuns!
2014-10-19T12:57:08+03:00
(1+13-2√13)/4+(1+13-2√13)/4=(14+14)/4=28/4=7
se foloseste la numarator formula 
(a+b)²=a²+2ab+b²
si
(a-b)²=a²-2ab+b²
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