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Stiind ca x/y=2/3, aflati: a)2x/2x+5y; b)x la puterea 2+y la puterea 2/ 2x la puterea 2

Răspuns :

(x^2+y^2)/2x^2 = (x^2/y^2 + 1)/2x^2/y^2 = (4/9 +1)/(2 x 4/9) = 13/9 x 8/9 = 13/8