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Cel mai inteligent răspuns!
2014-08-31T12:46:26+03:00
2014-08-31T12:49:15+03:00
Ridica prima fractie la puterea a doua in ambele parti.
x+ \frac{1}{x} = 5
 \\   x^{2} +  \frac{2x}{x} +  \frac{1}{ x^{2} } =  5^{2} 
 \\  x^{2} + 2 +  \frac{1}{ x^{2} } = 25 
 \\  x^{2} +  \frac{1}{ x^{2} } = 23