Rezolvare :
[tex]n = \frac{27 + x}{x} + \frac{27 + y}{ y} + \frac{27 + z}{z} = \frac{27}{x} + \frac{x}{x} + \frac{27}{y} + \frac{y}{y} + \frac{27}{z} + \frac{z}{z} = \frac{27}{x} + \frac{27}{y} + \frac{27}{z} + 3 = \frac{27xy + 27xz + 27yz}{xyz} + 3 = \frac{27(xy + xz + yz)}{xyz} + 3 = \frac{27xyz}{xyz} + 3 = 27 + 3 = 30[/tex]
