Răspuns :

[tex] {2}^{9}+{2}^{10}+{2}^{11}=n \times{2}^{9} [/tex]

[tex]512+1024+2048 = n\times{2}^{9} [/tex]

[tex]3584=n\times{2}^{9} [/tex]

[tex]n\times{2}^{9} =3584[/tex]

[tex]n\times 512=3584[/tex]

[tex]n=3584\div512[/tex]

[tex]n=7[/tex]

Sper că te-am ajutat