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Va rog ajutati-ma. Multumesc!

Va Rog Ajutatima Multumesc class=

Răspuns :

[tex]\frac{1}{9}<\frac{(n+1)^{2}}{27}<\frac{2}{3}[/tex]
[tex]\frac{3}{27}<\frac{(n+1)^{2}}{27}<\frac{18}{27}[/tex]
[tex]3<(n+1)^{2}<18[/tex]
[tex](n+1)^{2}\in\{4,9,16\}[/tex]
[tex]n+1\in\{2,3,4\}[/tex]
[tex]n\in\{1,2,3\}[/tex]