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Daca x supra 3 =y supra4, atunci x +y supra y -x




Răspuns :

x/3 = y/4 => y = 4x/3

(x + y)/(y - x) = (x + 4x/3)/(4x/3 - x) = (3x/3 + 4x/3)/(4x/3 - 3x/3) = (7x/3)/(x/3) = 7x/3 × 3/x = 7